20188860 has 48 divisors (see below), whose sum is σ = 59857056. Its totient is φ = 5066752.

The previous prime is 20188853. The next prime is 20188879. The reversal of 20188860 is 6888102.

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, 8877 + ... + 10916.

It is an arithmetic number, because the mean of its divisors is an integer number (1247022).

Almost surely, 2^20188860 is an apocalyptic number.

20188860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20188860 is an abundant number, since it is smaller than the sum of its proper divisors (39668196).

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

20188860 is a wasteful number, since it uses less digits than its factorization.

20188860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19822 (or 19820 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 20188860 is about 4493.2015312024. The cubic root of 20188860 is about 272.2934944731.

It can be divided in two parts, 2018 and 8860, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 20188860 in words is "twenty million, one hundred eighty-eight thousand, eight hundred sixty".