20418198 has 16 divisors (see below), whose sum is σ = 42985920. Its totient is φ = 6447816.

The previous prime is 20418193. The next prime is 20418199. The reversal of 20418198 is 89181402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20418193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89440 + ... + 89667.

It is an arithmetic number, because the mean of its divisors is an integer number (2686620).

Almost surely, 2^20418198 is an apocalyptic number.

20418198 is an abundant number, since it is smaller than the sum of its proper divisors (22567722).

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

20418198 is a wasteful number, since it uses less digits than its factorization.

20418198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179131.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 20418198 is about 4518.6500196408. The cubic root of 20418198 is about 273.3206660135.

The spelling of 20418198 in words is "twenty million, four hundred eighteen thousand, one hundred ninety-eight".