20994964 has 6 divisors (see below), whose sum is σ = 36741194. Its totient is φ = 10497480.

The previous prime is 20994959. The next prime is 20994979. The reversal of 20994964 is 46949902.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 1192464 = 4450^2 + 1092^2 .

It is a super-2 number, since 2×20994964² = 881577026722592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20994964.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2624367 + ... + 2624374.

Almost surely, 2^20994964 is an apocalyptic number.

It is an amenable number.

20994964 is a deficient number, since it is larger than the sum of its proper divisors (15746230).

20994964 is a wasteful number, since it uses less digits than its factorization.

20994964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5248745 (or 5248743 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 20994964 is about 4582.0261893621. The cubic root of 20994964 is about 275.8703619985.

The spelling of 20994964 in words is "twenty million, nine hundred ninety-four thousand, nine hundred sixty-four".