20887976 has 16 divisors (see below), whose sum is σ = 39255840. Its totient is φ = 10419760.

The previous prime is 20887967. The next prime is 20888003. The reversal of 20887976 is 67978802.

It is a self number, because there is not a number n which added to its sum of digits gives 20887976.

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, 941 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (2453490).

Almost surely, 2^20887976 is an apocalyptic number.

It is an amenable number.

20887976 is a deficient number, since it is larger than the sum of its proper divisors (18367864).

20887976 is a wasteful number, since it uses less digits than its factorization.

20887976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6064 (or 6060 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 20887976 is about 4570.3365302787. The cubic root of 20887976 is about 275.4009622026.

The spelling of 20887976 in words is "twenty million, eight hundred eighty-seven thousand, nine hundred seventy-six".