20697404 has 36 divisors (see below), whose sum is σ = 45380664. Its totient is φ = 8186976.

The previous prime is 20697389. The next prime is 20697421. The reversal of 20697404 is 40479602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1514 + ... + 6609.

It is an arithmetic number, because the mean of its divisors is an integer number (1260574).

Almost surely, 2^20697404 is an apocalyptic number.

It is an amenable number.

20697404 is an abundant number, since it is smaller than the sum of its proper divisors (24683260).

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

20697404 is a wasteful number, since it uses less digits than its factorization.

20697404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8154 (or 8145 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20697404 is about 4549.4399655342. The cubic root of 20697404 is about 274.5608594514.

The spelling of 20697404 in words is "twenty million, six hundred ninety-seven thousand, four hundred four".