20128408 has 48 divisors (see below), whose sum is σ = 41438520. Its totient is φ = 9132288.

The previous prime is 20128399. The next prime is 20128411. The reversal of 20128408 is 80482102.

It is a super-2 number, since 2×20128408² = 810305617228928, which contains 22 as substring.

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, 300391 + ... + 300457.

Almost surely, 2^20128408 is an apocalyptic number.

It is an amenable number.

20128408 is an abundant number, since it is smaller than the sum of its proper divisors (21310112).

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

20128408 is a wasteful number, since it uses less digits than its factorization.

20128408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 20128408 is about 4486.4694359819. The cubic root of 20128408 is about 272.0214443877.

The spelling of 20128408 in words is "twenty million, one hundred twenty-eight thousand, four hundred eight".