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20420902401 = 3174375712301
BaseRepresentation
bin10011000001001011…
…100011111000000001
31221201011112022210120
4103001023203320001
5313310222334101
613214202450453
71322022543414
oct230113437001
957634468716
1020420902401
11872a081249
123b5ab03a29
131c05957303
14dba16bb7b
157e7bacb36
hex4c12e3e01

20420902401 has 32 divisors (see below), whose sum is σ = 29541333888. Its totient is φ = 12497587200.

The previous prime is 20420902387. The next prime is 20420902423. The reversal of 20420902401 is 10420902402.

It is not a de Polignac number, because 20420902401 - 29 = 20420901889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20420907401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1653951 + ... + 1666251.

It is an arithmetic number, because the mean of its divisors is an integer number (923166684).

Almost surely, 220420902401 is an apocalyptic number.

It is an amenable number.

20420902401 is a deficient number, since it is larger than the sum of its proper divisors (9120431487).

20420902401 is a wasteful number, since it uses less digits than its factorization.

20420902401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13121.

The product of its (nonzero) digits is 1152, while the sum is 24.

Subtracting from 20420902401 its reverse (10420902402), we obtain a palindrome (9999999999).

The spelling of 20420902401 in words is "twenty billion, four hundred twenty million, nine hundred two thousand, four hundred one".

Divisors: 1 3 17 43 51 129 731 757 2193 2271 12301 12869 32551 36903 38607 97653 209117 528943 553367 627351 1586829 1660101 8992031 9311857 26976093 27935571 158301569 400409851 474904707 1201229553 6806967467 20420902401