20564037 has 40 divisors (see below), whose sum is σ = 33744480. Its totient is φ = 12402720.

The previous prime is 20564021. The next prime is 20564039. The reversal of 20564037 is 73046502.

It is a happy number.

It is not a de Polignac number, because 20564037 - 2⁴ = 20564021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20564037.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 61962 + ... + 62292.

It is an arithmetic number, because the mean of its divisors is an integer number (843612).

Almost surely, 2^20564037 is an apocalyptic number.

20564037 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20564037 is a deficient number, since it is larger than the sum of its proper divisors (13180443).

20564037 is a wasteful number, since it uses less digits than its factorization.

20564037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20564037 is about 4534.7587587434. The cubic root of 20564037 is about 273.9698627766.

The spelling of 20564037 in words is "twenty million, five hundred sixty-four thousand, thirty-seven".