20642408 has 32 divisors (see below), whose sum is σ = 41342400. Its totient is φ = 9639168.

The previous prime is 20642371. The next prime is 20642423. The reversal of 20642408 is 80424602.

It is a super-2 number, since 2×20642408² = 852218016076928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6608 + ... + 9216.

It is an arithmetic number, because the mean of its divisors is an integer number (1291950).

Almost surely, 2^20642408 is an apocalyptic number.

It is an amenable number.

20642408 is an abundant number, since it is smaller than the sum of its proper divisors (20699992).

20642408 is a wasteful number, since it uses less digits than its factorization.

20642408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681 (or 2677 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 20642408 is about 4543.3916846338. The cubic root of 20642408 is about 274.3174610864.

The spelling of 20642408 in words is "twenty million, six hundred forty-two thousand, four hundred eight".