20264645 has 4 divisors (see below), whose sum is σ = 24317580. Its totient is φ = 16211712.

The previous prime is 20264609. The next prime is 20264689. The reversal of 20264645 is 54646202.

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 12773476 + 7491169 = 3574^2 + 2737^2 .

It is a cyclic number.

It is not a de Polignac number, because 20264645 - 2⁸ = 20264389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026460 + ... + 2026469.

It is an arithmetic number, because the mean of its divisors is an integer number (6079395).

Almost surely, 2^20264645 is an apocalyptic number.

It is an amenable number.

20264645 is a deficient number, since it is larger than the sum of its proper divisors (4052935).

20264645 is an equidigital number, since it uses as much as digits as its factorization.

20264645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052934.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20264645 is about 4501.6269281228. The cubic root of 20264645 is about 272.6337810689.

The spelling of 20264645 in words is "twenty million, two hundred sixty-four thousand, six hundred forty-five".