20195898 has 48 divisors (see below), whose sum is σ = 45239520. Its totient is φ = 5992704.

The previous prime is 20195893. The next prime is 20195933. The reversal of 20195898 is 89859102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20195891) 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 23 ways as a sum of consecutive naturals, for example, 32640 + ... + 33252.

It is an arithmetic number, because the mean of its divisors is an integer number (942490).

Almost surely, 2^20195898 is an apocalyptic number.

20195898 is an abundant number, since it is smaller than the sum of its proper divisors (25043622).

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

20195898 is a wasteful number, since it uses less digits than its factorization.

20195898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 20195898 is about 4493.9846461687. The cubic root of 20195898 is about 272.3251320357.

The spelling of 20195898 in words is "twenty million, one hundred ninety-five thousand, eight hundred ninety-eight".