20320635057 has 16 divisors (see below), whose sum is σ = 27393125760. Its totient is φ = 13397962752.

The previous prime is 20320635019. The next prime is 20320635073. The reversal of 20320635057 is 75053602302.

It is not a de Polignac number, because 20320635057 - 2²⁶ = 20253526193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20320636057) 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, 194863 + ... + 280379.

It is an arithmetic number, because the mean of its divisors is an integer number (1712070360).

Almost surely, 2^20320635057 is an apocalyptic number.

It is an amenable number.

20320635057 is a deficient number, since it is larger than the sum of its proper divisors (7072490703).

20320635057 is a wasteful number, since it uses less digits than its factorization.

20320635057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86392.

The product of its (nonzero) digits is 37800, while the sum is 33.

The spelling of 20320635057 in words is "twenty billion, three hundred twenty million, six hundred thirty-five thousand, fifty-seven".