20331990265 has 4 divisors (see below), whose sum is σ = 24398388324. Its totient is φ = 16265592208.

The previous prime is 20331990257. The next prime is 20331990353. The reversal of 20331990265 is 56209913302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14959246864 + 5372743401 = 122308^2 + 73299^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331990265 - 2³ = 20331990257 is a prime.

It is a Duffinian number.

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, 2033199022 + ... + 2033199031.

It is an arithmetic number, because the mean of its divisors is an integer number (6099597081).

Almost surely, 2^20331990265 is an apocalyptic number.

It is an amenable number.

20331990265 is a deficient number, since it is larger than the sum of its proper divisors (4066398059).

20331990265 is an equidigital number, since it uses as much as digits as its factorization.

20331990265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066398058.

The product of its (nonzero) digits is 87480, while the sum is 40.

The spelling of 20331990265 in words is "twenty billion, three hundred thirty-one million, nine hundred ninety thousand, two hundred sixty-five".