20165564 has 12 divisors (see below), whose sum is σ = 35544600. Its totient is φ = 10009968.

The previous prime is 20165557. The next prime is 20165567. The reversal of 20165564 is 46556102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17579 + ... + 18690.

It is an arithmetic number, because the mean of its divisors is an integer number (2962050).

Almost surely, 2^20165564 is an apocalyptic number.

It is an amenable number.

20165564 is a deficient number, since it is larger than the sum of its proper divisors (15379036).

20165564 is a wasteful number, since it uses less digits than its factorization.

20165564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36412 (or 36410 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20165564 is about 4490.6084220292. The cubic root of 20165564 is about 272.1887206740.

The spelling of 20165564 in words is "twenty million, one hundred sixty-five thousand, five hundred sixty-four".