20635668 has 24 divisors (see below), whose sum is σ = 53500160. Its totient is φ = 6878520.

The previous prime is 20635649. The next prime is 20635673. The reversal of 20635668 is 86653602.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95428 + ... + 95643.

Almost surely, 2^20635668 is an apocalyptic number.

It is an amenable number.

20635668 is an abundant number, since it is smaller than the sum of its proper divisors (32864492).

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

20635668 is a wasteful number, since it uses less digits than its factorization.

20635668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191084 (or 191076 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 20635668 is about 4542.6498874556. The cubic root of 20635668 is about 274.2876018285.

The spelling of 20635668 in words is "twenty million, six hundred thirty-five thousand, six hundred sixty-eight".