20188830 has 32 divisors (see below), whose sum is σ = 51004800. Its totient is φ = 5100192.

The previous prime is 20188829. The next prime is 20188841. The reversal of 20188830 is 3888102.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 17140 + ... + 18279.

It is an arithmetic number, because the mean of its divisors is an integer number (1593900).

Almost surely, 2^20188830 is an apocalyptic number.

20188830 is an abundant number, since it is smaller than the sum of its proper divisors (30815970).

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

20188830 is a wasteful number, since it uses less digits than its factorization.

20188830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35448.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 20188830 is about 4493.1981928243. The cubic root of 20188830 is about 272.2933595999.

The spelling of 20188830 in words is "twenty million, one hundred eighty-eight thousand, eight hundred thirty".