20264921 has 4 divisors (see below), whose sum is σ = 20647332. Its totient is φ = 19882512.

The previous prime is 20264899. The next prime is 20264927. The reversal of 20264921 is 12946202.

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 11999296 + 8265625 = 3464^2 + 2875^2 .

It is a cyclic number.

It is not a de Polignac number, because 20264921 - 2⁶ = 20264857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20264927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191126 + ... + 191231.

It is an arithmetic number, because the mean of its divisors is an integer number (5161833).

Almost surely, 2^20264921 is an apocalyptic number.

It is an amenable number.

20264921 is a deficient number, since it is larger than the sum of its proper divisors (382411).

20264921 is an equidigital number, since it uses as much as digits as its factorization.

20264921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382410.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20264921 is about 4501.6575836018. The cubic root of 20264921 is about 272.6350188007.

The spelling of 20264921 in words is "twenty million, two hundred sixty-four thousand, nine hundred twenty-one".