20356504131 has 16 divisors (see below), whose sum is σ = 28327942656. Its totient is φ = 12978278016.

The previous prime is 20356504127. The next prime is 20356504211. The reversal of 20356504131 is 13140565302.

It is not a de Polignac number, because 20356504131 - 2² = 20356504127 is a prime.

It is a super-2 number, since 2×20356504131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20356504111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338091 + ... + 393723.

It is an arithmetic number, because the mean of its divisors is an integer number (1770496416).

Almost surely, 2^20356504131 is an apocalyptic number.

20356504131 is a deficient number, since it is larger than the sum of its proper divisors (7971438525).

20356504131 is a wasteful number, since it uses less digits than its factorization.

20356504131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60962.

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 20356504131 in words is "twenty billion, three hundred fifty-six million, five hundred four thousand, one hundred thirty-one".