20899976 has 8 divisors (see below), whose sum is σ = 39187470. Its totient is φ = 10449984.

The previous prime is 20899969. The next prime is 20899979. The reversal of 20899976 is 67999802.

It can be written as a sum of positive squares in only one way, i.e., 13468900 + 7431076 = 3670^2 + 2726^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20899979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1306241 + ... + 1306256.

Almost surely, 2^20899976 is an apocalyptic number.

It is an amenable number.

20899976 is a deficient number, since it is larger than the sum of its proper divisors (18287494).

20899976 is a wasteful number, since it uses less digits than its factorization.

20899976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612503 (or 2612499 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 20899976 is about 4571.6491553924. The cubic root of 20899976 is about 275.4536907658.

The spelling of 20899976 in words is "twenty million, eight hundred ninety-nine thousand, nine hundred seventy-six".