20065564 has 24 divisors (see below), whose sum is σ = 37220400. Its totient is φ = 9448320.

The previous prime is 20065553. The next prime is 20065597. The reversal of 20065564 is 46556002.

It is a congruent number.

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, 2647 + ... + 6865.

It is an arithmetic number, because the mean of its divisors is an integer number (1550850).

Almost surely, 2^20065564 is an apocalyptic number.

It is an amenable number.

20065564 is a deficient number, since it is larger than the sum of its proper divisors (17154836).

20065564 is a wasteful number, since it uses less digits than its factorization.

20065564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4293 (or 4291 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20065564 is about 4479.4602353409. The cubic root of 20065564 is about 271.7380515901.

The spelling of 20065564 in words is "twenty million, sixty-five thousand, five hundred sixty-four".