20964967 has 2 divisors, whose sum is σ = 20964968. Its totient is φ = 20964966.

The previous prime is 20964947. The next prime is 20964971. The reversal of 20964967 is 76946902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20964967 - 2¹⁵ = 20932199 is a prime.

It is a super-2 number, since 2×20964967² = 879059682622178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20964917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10482483 + 10482484.

It is an arithmetic number, because the mean of its divisors is an integer number (10482484).

Almost surely, 2^20964967 is an apocalyptic number.

20964967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20964967 is an equidigital number, since it uses as much as digits as its factorization.

20964967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 20964967 is about 4578.7516857764. The cubic root of 20964967 is about 275.7389141659.

The spelling of 20964967 in words is "twenty million, nine hundred sixty-four thousand, nine hundred sixty-seven".