20964931 has 8 divisors (see below), whose sum is σ = 22638560. Its totient is φ = 19300032.

The previous prime is 20964919. The next prime is 20964947. The reversal of 20964931 is 13946902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20964931 - 2⁷ = 20964803 is a prime.

It is a super-2 number, since 2×20964931² = 879056663669522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20964971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3346 + ... + 7288.

It is an arithmetic number, because the mean of its divisors is an integer number (2829820).

Almost surely, 2^20964931 is an apocalyptic number.

20964931 is a deficient number, since it is larger than the sum of its proper divisors (1673629).

20964931 is a wasteful number, since it uses less digits than its factorization.

20964931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4365.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20964931 is about 4578.7477545722. The cubic root of 20964931 is about 275.7387563374.

The spelling of 20964931 in words is "twenty million, nine hundred sixty-four thousand, nine hundred thirty-one".