20697388 has 6 divisors (see below), whose sum is σ = 36220436. Its totient is φ = 10348692.

The previous prime is 20697379. The next prime is 20697389. The reversal of 20697388 is 88379602.

It is not an unprimeable number, because it can be changed into a prime (20697389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2587170 + ... + 2587177.

Almost surely, 2^20697388 is an apocalyptic number.

It is an amenable number.

20697388 is a deficient number, since it is larger than the sum of its proper divisors (15523048).

20697388 is a wasteful number, since it uses less digits than its factorization.

20697388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5174351 (or 5174349 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20697388 is about 4549.4382070757. The cubic root of 20697388 is about 274.5607887022.

The spelling of 20697388 in words is "twenty million, six hundred ninety-seven thousand, three hundred eighty-eight".