20312641765 has 24 divisors (see below), whose sum is σ = 26525165688. Its totient is φ = 14843145600.

The previous prime is 20312641763. The next prime is 20312641781. The reversal of 20312641765 is 56714621302.

It can be written as a sum of positive squares in 4 ways, for example, as 3369454209 + 16943187556 = 58047^2 + 130166^2 .

It is not a de Polignac number, because 20312641765 - 2¹ = 20312641763 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312641763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11546956 + ... + 11548714.

It is an arithmetic number, because the mean of its divisors is an integer number (1105215237).

Almost surely, 2^20312641765 is an apocalyptic number.

It is an amenable number.

20312641765 is a deficient number, since it is larger than the sum of its proper divisors (6212523923).

20312641765 is an equidigital number, since it uses as much as digits as its factorization.

20312641765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3637 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 20312641765 in words is "twenty billion, three hundred twelve million, six hundred forty-one thousand, seven hundred sixty-five".