20564616 has 32 divisors (see below), whose sum is σ = 52668000. Its totient is φ = 6687360.

The previous prime is 20564603. The next prime is 20564623. The reversal of 20564616 is 61646502.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9466 + ... + 11433.

It is an arithmetic number, because the mean of its divisors is an integer number (1645875).

Almost surely, 2^20564616 is an apocalyptic number.

It is an amenable number.

20564616 is an abundant number, since it is smaller than the sum of its proper divisors (32103384).

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

20564616 is a wasteful number, since it uses less digits than its factorization.

20564616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20949 (or 20945 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20564616 is about 4534.8225985147. The cubic root of 20564616 is about 273.9724340464.

The spelling of 20564616 in words is "twenty million, five hundred sixty-four thousand, six hundred sixteen".