420

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420 < 419 | 421 >
All Numbers
400	401	402	403	404	405	406	407	408	409
410	411	412	413	414	415	416	417	418	419
420	421	422	423	424	425	426	427	428	429
430	431	432	433	434	435	436	437	438	439
440	441	442	443	444	445	446	447	448	449
450	451	452	453	454	455	456	457	458	459
460	461	462	463	464	465	466	467	468	469
470	471	472	473	474	475	476	477	478	479
480	481	482	483	484	485	486	487	488	489
490	491	492	493	494	495	496	497	498	499

420 is the number following 419 and preceding 421.

Properties

• Its factors are 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210 and 420, making it a composite number. It is also a cubefree number.
• 420 is an even number .
• 420 is an unhappy number.
  

• 420 is a pronic number.
  
• 420 is abundant.
  
• Its prime factorization is 2² × 3¹ × 5¹ × 7¹.
  

Approximations

Notation	Lower bound	Upper bound
Up-arrow notation	20 ↑ 2
Scientific notation	4.2 x 102	4.201 x 102
Slow-growing hierarchy	\(g_{\omega^{\omega}}(4)\)	\(g_{\omega^{\omega}}(5)\)
Copy notation	3[3]	4[3]
Chained arrow notation	20 → 2
Bowers' Exploding Array Function/Bird's array notation	{20,2}
Fast-growing hierarchy	f2(6)	f2(7)
Hardy hierarchy	Hω(210)	Hω(210)
Middle-growing hierarchy	m(ω,8)	m(ω,9)
Hyper-E notation	E2.6232
Hyper-E notation (non-10 base)	\(E[20]2\)
Hyperfactorial array notation	5!	6!
X-Sequence Hyper-Exponential Notation	20{1}2
Steinhaus-Moser Notation	4[3]	5[3]
PlantStar's Debut Notation	[1]	[2]
H* function	H(-0.2)	H(-0.1)
Bashicu matrix system with respect to version 4	(0)[20]	(0)[21]
m(n) map	m(1)(4)	m(1)(5)
s(n) map	\(s(1)(\lambda x . x+1)(209)\)	\(s(1)(\lambda x . x+1)(210)\)