20188870 has 16 divisors (see below), whose sum is σ = 39135600. Its totient is φ = 7454304.

The previous prime is 20188853. The next prime is 20188879. The reversal of 20188870 is 7888102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20188879) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 77520 + ... + 77779.

It is an arithmetic number, because the mean of its divisors is an integer number (2445975).

Almost surely, 2^20188870 is an apocalyptic number.

20188870 is a deficient number, since it is larger than the sum of its proper divisors (18946730).

20188870 is a wasteful number, since it uses less digits than its factorization.

20188870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155319.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 20188870 is about 4493.2026439946. The cubic root of 20188870 is about 272.2935394308.

The spelling of 20188870 in words is "twenty million, one hundred eighty-eight thousand, eight hundred seventy".