20945808 has 120 divisors (see below), whose sum is σ = 64454208. Its totient is φ = 6310656.

The previous prime is 20945807. The next prime is 20945833. The reversal of 20945808 is 80854902.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (20945803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125341 + ... + 125507.

Almost surely, 2^20945808 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 20945808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32227104).

20945808 is an abundant number, since it is smaller than the sum of its proper divisors (43508400).

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

20945808 is a wasteful number, since it uses less digits than its factorization.

20945808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20945808 is about 4576.6590434508. The cubic root of 20945808 is about 275.6548931744.

The spelling of 20945808 in words is "twenty million, nine hundred forty-five thousand, eight hundred eight".