20899008 has 84 divisors (see below), whose sum is σ = 64534288. Its totient is φ = 6428160.

The previous prime is 20898953. The next prime is 20899037. The reversal of 20899008 is 80099802.

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

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, 6093 + ... + 8883.

Almost surely, 2^20899008 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 20899008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32267144).

20899008 is an abundant number, since it is smaller than the sum of its proper divisors (43635280).

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

20899008 is a wasteful number, since it uses less digits than its factorization.

20899008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822 (or 2809 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 20899008 is about 4571.5432842750. The cubic root of 20899008 is about 275.4494380768.

The spelling of 20899008 in words is "twenty million, eight hundred ninety-nine thousand, eight".