20215008 has 120 divisors (see below), whose sum is σ = 64947960. Its totient is φ = 6117120.

The previous prime is 20214991. The next prime is 20215021. The reversal of 20215008 is 80051202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28158 + ... + 28866.

It is an arithmetic number, because the mean of its divisors is an integer number (541233).

Almost surely, 2^20215008 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 20215008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32473980).

20215008 is an abundant number, since it is smaller than the sum of its proper divisors (44732952).

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

20215008 is a wasteful number, since it uses less digits than its factorization.

20215008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 725 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20215008 is about 4496.1103189312. The cubic root of 20215008 is about 272.4109991871.

The spelling of 20215008 in words is "twenty million, two hundred fifteen thousand, eight".