20577988 has 12 divisors (see below), whose sum is σ = 37906960. Its totient is φ = 9747432.

The previous prime is 20577979. The next prime is 20578009. The reversal of 20577988 is 88977502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135306 + ... + 135457.

Almost surely, 2^20577988 is an apocalyptic number.

It is an amenable number.

20577988 is a deficient number, since it is larger than the sum of its proper divisors (17328972).

20577988 is a wasteful number, since it uses less digits than its factorization.

20577988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270786 (or 270784 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 20577988 is about 4536.2967275080. The cubic root of 20577988 is about 274.0318040764.

The spelling of 20577988 in words is "twenty million, five hundred seventy-seven thousand, nine hundred eighty-eight".