20964867 has 32 divisors (see below), whose sum is σ = 35610624. Its totient is φ = 10653600.

The previous prime is 20964857. The next prime is 20964871. The reversal of 20964867 is 76846902.

It is not a de Polignac number, because 20964867 - 2⁴ = 20964851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20964857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9892 + ... + 11822.

It is an arithmetic number, because the mean of its divisors is an integer number (1112832).

Almost surely, 2^20964867 is an apocalyptic number.

20964867 is a deficient number, since it is larger than the sum of its proper divisors (14645757).

20964867 is a wasteful number, since it uses less digits than its factorization.

20964867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20964867 is about 4578.7407657565. The cubic root of 20964867 is about 275.7384757530.

The spelling of 20964867 in words is "twenty million, nine hundred sixty-four thousand, eight hundred sixty-seven".