20964339 has 72 divisors (see below), whose sum is σ = 37180416. Its totient is φ = 11761200.

The previous prime is 20964331. The next prime is 20964343. The reversal of 20964339 is 93346902.

It is a happy number.

20964339 is a `hidden beast` number, since 2 + 0 + 9 + 643 + 3 + 9 = 666.

It is not a de Polignac number, because 20964339 - 2³ = 20964331 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964331) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 676254 + ... + 676284.

Almost surely, 2^20964339 is an apocalyptic number.

20964339 is a deficient number, since it is larger than the sum of its proper divisors (16216077).

20964339 is a wasteful number, since it uses less digits than its factorization.

20964339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 20964339 is about 4578.6831076195. The cubic root of 20964339 is about 275.7361609098.

The spelling of 20964339 in words is "twenty million, nine hundred sixty-four thousand, three hundred thirty-nine".