20697708 has 24 divisors (see below), whose sum is σ = 49853440. Its totient is φ = 6676560.

The previous prime is 20697701. The next prime is 20697709. The reversal of 20697708 is 80779602.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20697701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27448 + ... + 28191.

Almost surely, 2^20697708 is an apocalyptic number.

It is an amenable number.

20697708 is an abundant number, since it is smaller than the sum of its proper divisors (29155732).

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

20697708 is a wasteful number, since it uses less digits than its factorization.

20697708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55677 (or 55675 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 20697708 is about 4549.4733761173. The cubic root of 20697708 is about 274.5622036795.

The spelling of 20697708 in words is "twenty million, six hundred ninety-seven thousand, seven hundred eight".