20899964 has 6 divisors (see below), whose sum is σ = 36574944. Its totient is φ = 10449980.

The previous prime is 20899961. The next prime is 20899969. The reversal of 20899964 is 46999802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20899961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2612492 + ... + 2612499.

It is an arithmetic number, because the mean of its divisors is an integer number (6095824).

Almost surely, 2^20899964 is an apocalyptic number.

It is an amenable number.

20899964 is a deficient number, since it is larger than the sum of its proper divisors (15674980).

20899964 is a wasteful number, since it uses less digits than its factorization.

20899964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5224995 (or 5224993 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 20899964 is about 4571.6478429555. The cubic root of 20899964 is about 275.4536380473.

The spelling of 20899964 in words is "twenty million, eight hundred ninety-nine thousand, nine hundred sixty-four".