20797976 has 8 divisors (see below), whose sum is σ = 38996220. Its totient is φ = 10398984.

The previous prime is 20797961. The next prime is 20797981. The reversal of 20797976 is 67979702.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20797976.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1299866 + ... + 1299881.

Almost surely, 2^20797976 is an apocalyptic number.

It is an amenable number.

20797976 is a deficient number, since it is larger than the sum of its proper divisors (18198244).

20797976 is a wasteful number, since it uses less digits than its factorization.

20797976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599753 (or 2599749 counting only the distinct ones).

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 20797976 is about 4560.4797993194. The cubic root of 20797976 is about 275.0048528069.

The spelling of 20797976 in words is "twenty million, seven hundred ninety-seven thousand, nine hundred seventy-six".