20764165 has 12 divisors (see below), whose sum is σ = 25367724. Its totient is φ = 16316096.

The previous prime is 20764153. The next prime is 20764187. The reversal of 20764165 is 56146702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9054081 + 11710084 = 3009^2 + 3422^2 .

It is not a de Polignac number, because 20764165 - 2¹⁵ = 20731397 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, 16809 + ... + 18001.

It is an arithmetic number, because the mean of its divisors is an integer number (2113977).

Almost surely, 2^20764165 is an apocalyptic number.

It is an amenable number.

20764165 is a deficient number, since it is larger than the sum of its proper divisors (4603559).

20764165 is an equidigital number, since it uses as much as digits as its factorization.

20764165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20764165 is about 4556.7713350573. The cubic root of 20764165 is about 274.8557480369.

It can be divided in two parts, 2076 and 4165, that added together give a square (6241 = 79²).

The spelling of 20764165 in words is "twenty million, seven hundred sixty-four thousand, one hundred sixty-five".