20569988 has 12 divisors (see below), whose sum is σ = 37158912. Its totient is φ = 9953160.

The previous prime is 20569933. The next prime is 20569999. The reversal of 20569988 is 88996502.

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, 82820 + ... + 83067.

It is an arithmetic number, because the mean of its divisors is an integer number (3096576).

Almost surely, 2^20569988 is an apocalyptic number.

It is an amenable number.

20569988 is a deficient number, since it is larger than the sum of its proper divisors (16588924).

20569988 is a wasteful number, since it uses less digits than its factorization.

20569988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165922 (or 165920 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 20569988 is about 4535.4148652576. The cubic root of 20569988 is about 273.9962881554.

The spelling of 20569988 in words is "twenty million, five hundred sixty-nine thousand, nine hundred eighty-eight".