20704408 has 8 divisors (see below), whose sum is σ = 38820780. Its totient is φ = 10352200.

The previous prime is 20704403. The next prime is 20704417. The reversal of 20704408 is 80440702.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20704403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1294018 + ... + 1294033.

Almost surely, 2^20704408 is an apocalyptic number.

It is an amenable number.

20704408 is a deficient number, since it is larger than the sum of its proper divisors (18116372).

20704408 is a wasteful number, since it uses less digits than its factorization.

20704408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588057 (or 2588053 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 20704408 is about 4550.2096654989. The cubic root of 20704408 is about 274.5918264169.

It can be divided in two parts, 20704 and 408, that added together give a palindrome (21112).

The spelling of 20704408 in words is "twenty million, seven hundred four thousand, four hundred eight".