20988976 has 20 divisors (see below), whose sum is σ = 40808152. Its totient is φ = 10457856.

The previous prime is 20988973. The next prime is 20988991. The reversal of 20988976 is 67988902.

It is a happy number.

It is a super-2 number, since 2×20988976² = 881074227057152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20988973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776 + ... + 7048.

Almost surely, 2^20988976 is an apocalyptic number.

It is an amenable number.

20988976 is a deficient number, since it is larger than the sum of its proper divisors (19819176).

20988976 is a wasteful number, since it uses less digits than its factorization.

20988976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588 (or 4582 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 20988976 is about 4581.3727200480. The cubic root of 20988976 is about 275.8441323941.

The spelling of 20988976 in words is "twenty million, nine hundred eighty-eight thousand, nine hundred seventy-six".