20115180 has 36 divisors (see below), whose sum is σ = 61016592. Its totient is φ = 5364000.

The previous prime is 20115127. The next prime is 20115191. The reversal of 20115180 is 8151102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55696 + ... + 56055.

Almost surely, 2^20115180 is an apocalyptic number.

20115180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20115180 is an abundant number, since it is smaller than the sum of its proper divisors (40901412).

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

20115180 is a wasteful number, since it uses less digits than its factorization.

20115180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111766 (or 111761 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 20115180 is about 4484.9949832748. The cubic root of 20115180 is about 271.9618422539.

Adding to 20115180 its reverse (8151102), we get a palindrome (28266282).

The spelling of 20115180 in words is "twenty million, one hundred fifteen thousand, one hundred eighty".