20851257536 has 28 divisors (see below), whose sum is σ = 41384034072. Its totient is φ = 10423784448.

The previous prime is 20851257527. The next prime is 20851257563. The reversal of 20851257536 is 63575215802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380951 + ... + 432233.

Almost surely, 2^20851257536 is an apocalyptic number.

It is an amenable number.

20851257536 is a deficient number, since it is larger than the sum of its proper divisors (20532776536).

20851257536 is an equidigital number, since it uses as much as digits as its factorization.

20851257536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57648 (or 57638 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 20851257536 in words is "twenty billion, eight hundred fifty-one million, two hundred fifty-seven thousand, five hundred thirty-six".