20697686 has 8 divisors (see below), whose sum is σ = 31273560. Its totient is φ = 10273168.

The previous prime is 20697659. The next prime is 20697701. The reversal of 20697686 is 68679602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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, 37496 + ... + 38043.

It is an arithmetic number, because the mean of its divisors is an integer number (3909195).

Almost surely, 2^20697686 is an apocalyptic number.

20697686 is a deficient number, since it is larger than the sum of its proper divisors (10575874).

20697686 is a wasteful number, since it uses less digits than its factorization.

20697686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75678.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 20697686 is about 4549.4709582544. The cubic root of 20697686 is about 274.5621064002.

The spelling of 20697686 in words is "twenty million, six hundred ninety-seven thousand, six hundred eighty-six".