20165556 has 24 divisors (see below), whose sum is σ = 48676320. Its totient is φ = 6489952.

The previous prime is 20165543. The next prime is 20165557. The reversal of 20165556 is 65556102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28626 + ... + 29321.

It is an arithmetic number, because the mean of its divisors is an integer number (2028180).

Almost surely, 2^20165556 is an apocalyptic number.

It is an amenable number.

20165556 is an abundant number, since it is smaller than the sum of its proper divisors (28510764).

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

20165556 is a wasteful number, since it uses less digits than its factorization.

20165556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57983 (or 57981 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 20165556 is about 4490.6075312813. The cubic root of 20165556 is about 272.1886846801.

The spelling of 20165556 in words is "twenty million, one hundred sixty-five thousand, five hundred fifty-six".