20198856 has 64 divisors (see below), whose sum is σ = 55226880. Its totient is φ = 6128640.

The previous prime is 20198837. The next prime is 20198903. The reversal of 20198856 is 65889102.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11850 + ... + 13446.

It is an arithmetic number, because the mean of its divisors is an integer number (862920).

Almost surely, 2^20198856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20198856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27613440).

20198856 is an abundant number, since it is smaller than the sum of its proper divisors (35028024).

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

20198856 is a wasteful number, since it uses less digits than its factorization.

20198856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654 (or 1650 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 20198856 is about 4494.3137407173. The cubic root of 20198856 is about 272.3384267885.

The spelling of 20198856 in words is "twenty million, one hundred ninety-eight thousand, eight hundred fifty-six".