20967731 has 2 divisors, whose sum is σ = 20967732. Its totient is φ = 20967730.

The previous prime is 20967707. The next prime is 20967797. The reversal of 20967731 is 13776902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20967731 - 2¹⁰ = 20966707 is a prime.

It is a super-2 number, since 2×20967731² = 879291486576722, 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 = 20967691 and 20967700.

It is not a weakly prime, because it can be changed into another prime (20964731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483865 + 10483866.

It is an arithmetic number, because the mean of its divisors is an integer number (10483866).

Almost surely, 2^20967731 is an apocalyptic number.

20967731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20967731 is an equidigital number, since it uses as much as digits as its factorization.

20967731 is an evil number, because the sum of its binary digits is even.

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

The square root of 20967731 is about 4579.0535048195. The cubic root of 20967731 is about 275.7510313464.

The spelling of 20967731 in words is "twenty million, nine hundred sixty-seven thousand, seven hundred thirty-one".