20927808 has 140 divisors (see below), whose sum is σ = 67860672. Its totient is φ = 6324480.

The previous prime is 20927807. The next prime is 20927839. The reversal of 20927808 is 80872902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20927801) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 56841 + ... + 57207.

Almost surely, 2^20927808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20927808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33930336).

20927808 is an abundant number, since it is smaller than the sum of its proper divisors (46932864).

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

20927808 is a wasteful number, since it uses less digits than its factorization.

20927808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 20927808 is about 4574.6921207880. The cubic root of 20927808 is about 275.5759082358.

The spelling of 20927808 in words is "twenty million, nine hundred twenty-seven thousand, eight hundred eight".