20188020 has 48 divisors (see below), whose sum is σ = 58988160. Its totient is φ = 5149056.

The previous prime is 20188019. The next prime is 20188033. The reversal of 20188020 is 2088102.

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 15 ways as a sum of consecutive naturals, for example, 5935 + ... + 8694.

It is an arithmetic number, because the mean of its divisors is an integer number (1228920).

Almost surely, 2^20188020 is an apocalyptic number.

20188020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20188020 is an abundant number, since it is smaller than the sum of its proper divisors (38800140).

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

20188020 is a wasteful number, since it uses less digits than its factorization.

20188020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14664 (or 14662 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 20188020 is about 4493.1080556782. The cubic root of 20188020 is about 272.2897179728.

The spelling of 20188020 in words is "twenty million, one hundred eighty-eight thousand, twenty".