20118900 has 72 divisors (see below), whose sum is σ = 58676800. Its totient is φ = 5322240.

The previous prime is 20118881. The next prime is 20118911. The reversal of 20118900 is 981102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59532 + ... + 59868.

Almost surely, 2^20118900 is an apocalyptic number.

20118900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20118900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29338400).

20118900 is an abundant number, since it is smaller than the sum of its proper divisors (38557900).

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

20118900 is a wasteful number, since it uses less digits than its factorization.

20118900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 20118900 is about 4485.4096802856. The cubic root of 20118900 is about 271.9786063047.

The spelling of 20118900 in words is "twenty million, one hundred eighteen thousand, nine hundred".