20616636 has 12 divisors (see below), whose sum is σ = 48105512. Its totient is φ = 6872208.

The previous prime is 20616623. The next prime is 20616647. The reversal of 20616636 is 63661602.

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

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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, 859015 + ... + 859038.

Almost surely, 2^20616636 is an apocalyptic number.

It is an amenable number.

20616636 is an abundant number, since it is smaller than the sum of its proper divisors (27488876).

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

20616636 is a wasteful number, since it uses less digits than its factorization.

20616636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718060 (or 1718058 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 20616636 is about 4540.5545916771. The cubic root of 20616636 is about 274.2032519654.

The spelling of 20616636 in words is "twenty million, six hundred sixteen thousand, six hundred thirty-six".