20802765631 has 2 divisors, whose sum is σ = 20802765632. Its totient is φ = 20802765630.

The previous prime is 20802765617. The next prime is 20802765637. The reversal of 20802765631 is 13656720802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20802765631 - 2²⁷ = 20668547903 is a prime.

It is a super-2 number, since 2×20802765631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20802765637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10401382815 + 10401382816.

It is an arithmetic number, because the mean of its divisors is an integer number (10401382816).

Almost surely, 2^20802765631 is an apocalyptic number.

20802765631 is a deficient number, since it is larger than the sum of its proper divisors (1).

20802765631 is an equidigital number, since it uses as much as digits as its factorization.

20802765631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 20802765631 in words is "twenty billion, eight hundred two million, seven hundred sixty-five thousand, six hundred thirty-one".