20115100104 has 64 divisors (see below), whose sum is σ = 55073010240. Its totient is φ = 6071746560.

The previous prime is 20115100081. The next prime is 20115100121. The reversal of 20115100104 is 40100151102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80389 + ... + 216084.

It is an arithmetic number, because the mean of its divisors is an integer number (860515785).

Almost surely, 2^20115100104 is an apocalyptic number.

20115100104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20115100104 is an abundant number, since it is smaller than the sum of its proper divisors (34957910136).

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

20115100104 is a wasteful number, since it uses less digits than its factorization.

20115100104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296750 (or 296746 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 20115100104 its reverse (40100151102), we get a palindrome (60215251206).

The spelling of 20115100104 in words is "twenty billion, one hundred fifteen million, one hundred thousand, one hundred four".