20115099900 has 288 divisors, whose sum is σ = 74358574080. Its totient is φ = 4569488640.

The previous prime is 20115099899. The next prime is 20115100003. The reversal of 20115099900 is 999051102.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3153114 + ... + 3159486.

Almost surely, 2^20115099900 is an apocalyptic number.

20115099900 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 20115099900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37179287040).

20115099900 is an abundant number, since it is smaller than the sum of its proper divisors (54243474180).

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

20115099900 is a wasteful number, since it uses less digits than its factorization.

20115099900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570 (or 6557 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The spelling of 20115099900 in words is "twenty billion, one hundred fifteen million, ninety-nine thousand, nine hundred".