20920712538 has 16 divisors (see below), whose sum is σ = 45645191136. Its totient is φ = 6339609840.

The previous prime is 20920712513. The next prime is 20920712551. The reversal of 20920712538 is 83521702902.

It is a junction number, because it is equal to n+sod(n) for n = 20920712496 and 20920712505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158490181 + ... + 158490312.

It is an arithmetic number, because the mean of its divisors is an integer number (2852824446).

Almost surely, 2^20920712538 is an apocalyptic number.

20920712538 is an abundant number, since it is smaller than the sum of its proper divisors (24724478598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20920712538 is a wasteful number, since it uses less digits than its factorization.

20920712538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316980509.

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 20920712538 in words is "twenty billion, nine hundred twenty million, seven hundred twelve thousand, five hundred thirty-eight".