20418188 has 24 divisors (see below), whose sum is σ = 40932864. Its totient is φ = 8730000.

The previous prime is 20418187. The next prime is 20418193. The reversal of 20418188 is 88181402.

It is not an unprimeable number, because it can be changed into a prime (20418187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20543 + ... + 21513.

It is an arithmetic number, because the mean of its divisors is an integer number (1705536).

Almost surely, 2^20418188 is an apocalyptic number.

20418188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20418188 is an abundant number, since it is smaller than the sum of its proper divisors (20514676).

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

20418188 is a wasteful number, since it uses less digits than its factorization.

20418188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733 (or 1731 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 20418188 is about 4518.6489131155. The cubic root of 20418188 is about 273.3206213931.

The spelling of 20418188 in words is "twenty million, four hundred eighteen thousand, one hundred eighty-eight".