20055987 has 12 divisors (see below), whose sum is σ = 33108400. Its totient is φ = 11460528.

The previous prime is 20055953. The next prime is 20055991. The reversal of 20055987 is 78955002.

20055987 is a `hidden beast` number, since 20 + 0 + 559 + 87 = 666.

It is not a de Polignac number, because 20055987 - 2⁶ = 20055923 is a prime.

It is a super-2 number, since 2×20055987² = 804485229088338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20055187) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159112 + ... + 159237.

Almost surely, 2^20055987 is an apocalyptic number.

20055987 is a deficient number, since it is larger than the sum of its proper divisors (13052413).

20055987 is a wasteful number, since it uses less digits than its factorization.

20055987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318362 (or 318359 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 20055987 is about 4478.3911173545. The cubic root of 20055987 is about 271.6948125120.

The spelling of 20055987 in words is "twenty million, fifty-five thousand, nine hundred eighty-seven".