20159800 has 24 divisors (see below), whose sum is σ = 46872000. Its totient is φ = 8063840.

The previous prime is 20159771. The next prime is 20159809. The reversal of 20159800 is 895102.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20159809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50200 + ... + 50599.

It is an arithmetic number, because the mean of its divisors is an integer number (1953000).

Almost surely, 2^20159800 is an apocalyptic number.

20159800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20159800 is an abundant number, since it is smaller than the sum of its proper divisors (26712200).

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

20159800 is a wasteful number, since it uses less digits than its factorization.

20159800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100815 (or 100806 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 20159800 is about 4489.9665923033. The cubic root of 20159800 is about 272.1627846230.

The spelling of 20159800 in words is "twenty million, one hundred fifty-nine thousand, eight hundred".