20890008 has 64 divisors (see below), whose sum is σ = 61452000. Its totient is φ = 6552576.

The previous prime is 20889943. The next prime is 20890019. The reversal of 20890008 is 80009802.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 828 + ... + 6516.

Almost surely, 2^20890008 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 20890008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30726000).

20890008 is an abundant number, since it is smaller than the sum of its proper divisors (40561992).

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

20890008 is a wasteful number, since it uses less digits than its factorization.

20890008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5721 (or 5711 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 20890008 is about 4570.5588279772. The cubic root of 20890008 is about 275.4098923260.

The spelling of 20890008 in words is "twenty million, eight hundred ninety thousand, eight".