20442198 has 64 divisors (see below), whose sum is σ = 48568320. Its totient is φ = 5616000.

The previous prime is 20442179. The next prime is 20442203. The reversal of 20442198 is 89124402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202348 + ... + 202448.

It is an arithmetic number, because the mean of its divisors is an integer number (758880).

Almost surely, 2^20442198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20442198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24284160).

20442198 is an abundant number, since it is smaller than the sum of its proper divisors (28126122).

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

20442198 is a wasteful number, since it uses less digits than its factorization.

20442198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20442198 is about 4521.3049001367. The cubic root of 20442198 is about 273.4277131278.

The spelling of 20442198 in words is "twenty million, four hundred forty-two thousand, one hundred ninety-eight".