20390927965 has 12 divisors (see below), whose sum is σ = 25824745404. Its totient is φ = 15454175616.

The previous prime is 20390927911. The next prime is 20390927971. The reversal of 20390927965 is 56972909302.

It can be written as a sum of positive squares in 2 ways, for example, as 15051118489 + 5339809476 = 122683^2 + 73074^2 .

It is not a de Polignac number, because 20390927965 - 2²³ = 20382539357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5646652 + ... + 5650261.

It is an arithmetic number, because the mean of its divisors is an integer number (2152062117).

Almost surely, 2^20390927965 is an apocalyptic number.

It is an amenable number.

20390927965 is a deficient number, since it is larger than the sum of its proper divisors (5433817439).

20390927965 is a wasteful number, since it uses less digits than its factorization.

20390927965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11296956 (or 11296937 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 52.

The spelling of 20390927965 in words is "twenty billion, three hundred ninety million, nine hundred twenty-seven thousand, nine hundred sixty-five".