20264021 has 4 divisors (see below), whose sum is σ = 20278944. Its totient is φ = 20249100.

The previous prime is 20263961. The next prime is 20264029. The reversal of 20264021 is 12046202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20264021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20264029) 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, 5195 + ... + 8216.

It is an arithmetic number, because the mean of its divisors is an integer number (5069736).

Almost surely, 2^20264021 is an apocalyptic number.

It is an amenable number.

20264021 is a deficient number, since it is larger than the sum of its proper divisors (14923).

20264021 is a wasteful number, since it uses less digits than its factorization.

20264021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14922.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20264021 is about 4501.5576193136. The cubic root of 20264021 is about 272.6309826775.

The spelling of 20264021 in words is "twenty million, two hundred sixty-four thousand, twenty-one".