20989676 has 12 divisors (see below), whose sum is σ = 37586472. Its totient is φ = 10250688.

The previous prime is 20989651. The next prime is 20989711. The reversal of 20989676 is 67698902.

It is a self number, because there is not a number n which added to its sum of digits gives 20989676.

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, 60845 + ... + 61188.

It is an arithmetic number, because the mean of its divisors is an integer number (3132206).

Almost surely, 2^20989676 is an apocalyptic number.

It is an amenable number.

20989676 is a deficient number, since it is larger than the sum of its proper divisors (16596796).

20989676 is a wasteful number, since it uses less digits than its factorization.

20989676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122080 (or 122078 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 20989676 is about 4581.4491157275. The cubic root of 20989676 is about 275.8471989046.

The spelling of 20989676 in words is "twenty million, nine hundred eighty-nine thousand, six hundred seventy-six".