20976731 has 2 divisors, whose sum is σ = 20976732. Its totient is φ = 20976730.

The previous prime is 20976727. The next prime is 20976751. The reversal of 20976731 is 13767902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20976731 - 2² = 20976727 is a prime.

It is a super-2 number, since 2×20976731² = 880046486892722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20976691 and 20976700.

It is not a weakly prime, because it can be changed into another prime (20976701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10488365 + 10488366.

It is an arithmetic number, because the mean of its divisors is an integer number (10488366).

Almost surely, 2^20976731 is an apocalyptic number.

20976731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20976731 is an equidigital number, since it uses as much as digits as its factorization.

20976731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20976731 is about 4580.0361352286. The cubic root of 20976731 is about 275.7904793325.

The spelling of 20976731 in words is "twenty million, nine hundred seventy-six thousand, seven hundred thirty-one".