20620644 has 24 divisors (see below), whose sum is σ = 52489248. Its totient is φ = 6248640.

The previous prime is 20620637. The next prime is 20620651. The reversal of 20620644 is 44602602.

It is an interprime number because it is at equal distance from previous prime (20620637) and next prime (20620651).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77977 + ... + 78240.

It is an arithmetic number, because the mean of its divisors is an integer number (2187052).

Almost surely, 2^20620644 is an apocalyptic number.

It is an amenable number.

20620644 is an abundant number, since it is smaller than the sum of its proper divisors (31868604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20620644 is a wasteful number, since it uses less digits than its factorization.

20620644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156235 (or 156233 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20620644 is about 4540.9959260057. The cubic root of 20620644 is about 274.2210197432.

The spelling of 20620644 in words is "twenty million, six hundred twenty thousand, six hundred forty-four".