20015130440 has 32 divisors (see below), whose sum is σ = 45063596160. Its totient is φ = 8000798400.

The previous prime is 20015130389. The next prime is 20015130451. The reversal of 20015130440 is 4403151002.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102176 + ... + 224655.

It is an arithmetic number, because the mean of its divisors is an integer number (1408237380).

Almost surely, 2^20015130440 is an apocalyptic number.

20015130440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20015130440 is an abundant number, since it is smaller than the sum of its proper divisors (25048465720).

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

20015130440 is a wasteful number, since it uses less digits than its factorization.

20015130440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328373 (or 328369 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20015130440 its reverse (4403151002), we get a palindrome (24418281442).

The spelling of 20015130440 in words is "twenty billion, fifteen million, one hundred thirty thousand, four hundred forty".