20976681 has 12 divisors (see below), whose sum is σ = 30743216. Its totient is φ = 12712920.

The previous prime is 20976661. The next prime is 20976701. The reversal of 20976681 is 18667902.

It is an interprime number because it is at equal distance from previous prime (20976661) and next prime (20976701).

It is not a de Polignac number, because 20976681 - 2⁵ = 20976649 is a prime.

It is a super-2 number, since 2×20976681² = 880042291551522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20976611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28531 + ... + 29256.

Almost surely, 2^20976681 is an apocalyptic number.

It is an amenable number.

20976681 is a deficient number, since it is larger than the sum of its proper divisors (9766535).

20976681 is a wasteful number, since it uses less digits than its factorization.

20976681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57812 (or 57801 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20976681 is about 4580.0306767532. The cubic root of 20976681 is about 275.7902602082.

It can be divided in two parts, 2097 and 6681, that added together give a palindrome (8778).

The spelling of 20976681 in words is "twenty million, nine hundred seventy-six thousand, six hundred eighty-one".