20199888 has 160 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 6044544.

The previous prime is 20199847. The next prime is 20199901. The reversal of 20199888 is 88899102.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 188731 + ... + 188837.

It is an arithmetic number, because the mean of its divisors is an integer number (401760).

Almost surely, 2^20199888 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 20199888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32140800).

20199888 is an abundant number, since it is smaller than the sum of its proper divisors (44081712).

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

20199888 is a wasteful number, since it uses less digits than its factorization.

20199888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 20199888 is about 4494.4285509951. The cubic root of 20199888 is about 272.3430648147.

The spelling of 20199888 in words is "twenty million, one hundred ninety-nine thousand, eight hundred eighty-eight".