20500408 has 8 divisors (see below), whose sum is σ = 38438280. Its totient is φ = 10250200.

The previous prime is 20500397. The next prime is 20500423. The reversal of 20500408 is 80400502.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281268 + ... + 1281283.

It is an arithmetic number, because the mean of its divisors is an integer number (4804785).

Almost surely, 2^20500408 is an apocalyptic number.

It is an amenable number.

20500408 is a deficient number, since it is larger than the sum of its proper divisors (17937872).

20500408 is a wasteful number, since it uses less digits than its factorization.

20500408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562557 (or 2562553 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20500408 is about 4527.7376249072. The cubic root of 20500408 is about 273.6869993954.

The spelling of 20500408 in words is "twenty million, five hundred thousand, four hundred eight".