20573564 has 24 divisors (see below), whose sum is σ = 39575088. Its totient is φ = 9280640.

The previous prime is 20573549. The next prime is 20573573. The reversal of 20573564 is 46537502.

It is a self number, because there is not a number n which added to its sum of digits gives 20573564.

It is a congruent number.

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, 4322 + ... + 7734.

It is an arithmetic number, because the mean of its divisors is an integer number (1648962).

Almost surely, 2^20573564 is an apocalyptic number.

It is an amenable number.

20573564 is a deficient number, since it is larger than the sum of its proper divisors (19001524).

20573564 is a wasteful number, since it uses less digits than its factorization.

20573564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565 (or 3563 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 20573564 is about 4535.8090788745. The cubic root of 20573564 is about 274.0121649100.

The spelling of 20573564 in words is "twenty million, five hundred seventy-three thousand, five hundred sixty-four".