20564416131 has 16 divisors (see below), whose sum is σ = 31370380800. Its totient is φ = 11738297088.

The previous prime is 20564416123. The next prime is 20564416139. The reversal of 20564416131 is 13161446502.

It is an interprime number because it is at equal distance from previous prime (20564416123) and next prime (20564416139).

It is not a de Polignac number, because 20564416131 - 2³ = 20564416123 is a prime.

It is a super-2 number, since 2×20564416131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20564416092 and 20564416101.

It is not an unprimeable number, because it can be changed into a prime (20564416139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 513486 + ... + 552083.

It is an arithmetic number, because the mean of its divisors is an integer number (1960648800).

Almost surely, 2^20564416131 is an apocalyptic number.

20564416131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20564416131 is a deficient number, since it is larger than the sum of its proper divisors (10805964669).

20564416131 is a wasteful number, since it uses less digits than its factorization.

20564416131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066498.

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 20564416131 in words is "twenty billion, five hundred sixty-four million, four hundred sixteen thousand, one hundred thirty-one".