20993604 has 12 divisors (see below), whose sum is σ = 48985104. Its totient is φ = 6997864.

The previous prime is 20993591. The next prime is 20993611. The reversal of 20993604 is 40639902.

It is a tau number, because it is divible by the number of its divisors (12).

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, 874722 + ... + 874745.

It is an arithmetic number, because the mean of its divisors is an integer number (4082092).

Almost surely, 2^20993604 is an apocalyptic number.

It is an amenable number.

20993604 is an abundant number, since it is smaller than the sum of its proper divisors (27991500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20993604 is a wasteful number, since it uses less digits than its factorization.

20993604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749474 (or 1749472 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20993604 is about 4581.8777809977. The cubic root of 20993604 is about 275.8644051447.

The spelling of 20993604 in words is "twenty million, nine hundred ninety-three thousand, six hundred four".