20807408 has 10 divisors (see below), whose sum is σ = 40314384. Its totient is φ = 10403696.

The previous prime is 20807407. The next prime is 20807443. The reversal of 20807408 is 80470802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20807407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650216 + ... + 650247.

Almost surely, 2^20807408 is an apocalyptic number.

It is an amenable number.

20807408 is a deficient number, since it is larger than the sum of its proper divisors (19506976).

20807408 is a wasteful number, since it uses less digits than its factorization.

20807408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300471 (or 1300465 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 20807408 is about 4561.5137838222. The cubic root of 20807408 is about 275.0464186106.

The spelling of 20807408 in words is "twenty million, eight hundred seven thousand, four hundred eight".