20989364 has 12 divisors (see below), whose sum is σ = 40070688. Its totient is φ = 9540600.

The previous prime is 20989349. The next prime is 20989391. The reversal of 20989364 is 46398902.

It is a happy number.

It is a super-2 number, since 2×20989364² = 881106802248992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238472 + ... + 238559.

It is an arithmetic number, because the mean of its divisors is an integer number (3339224).

Almost surely, 2^20989364 is an apocalyptic number.

It is an amenable number.

20989364 is a deficient number, since it is larger than the sum of its proper divisors (19081324).

20989364 is a wasteful number, since it uses less digits than its factorization.

20989364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477046 (or 477044 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20989364 is about 4581.4150652391. The cubic root of 20989364 is about 275.8458321255.

The spelling of 20989364 in words is "twenty million, nine hundred eighty-nine thousand, three hundred sixty-four".