20562645 has 16 divisors (see below), whose sum is σ = 32996160. Its totient is φ = 10934784.

The previous prime is 20562637. The next prime is 20562671. The reversal of 20562645 is 54626502.

It is not a de Polignac number, because 20562645 - 2³ = 20562637 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 15 ways as a sum of consecutive naturals, for example, 3877 + ... + 7493.

It is an arithmetic number, because the mean of its divisors is an integer number (2062260).

Almost surely, 2^20562645 is an apocalyptic number.

It is an amenable number.

20562645 is a deficient number, since it is larger than the sum of its proper divisors (12433515).

20562645 is a wasteful number, since it uses less digits than its factorization.

20562645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 20562645 is about 4534.6052749936. The cubic root of 20562645 is about 273.9636808734.

The spelling of 20562645 in words is "twenty million, five hundred sixty-two thousand, six hundred forty-five".