20115131020 has 24 divisors (see below), whose sum is σ = 42820432704. Its totient is φ = 7935831936.

The previous prime is 20115130979. The next prime is 20115131021. The reversal of 20115131020 is 2013151102.

It is a junction number, because it is equal to n+sod(n) for n = 20115130985 and 20115131003.

It is not an unprimeable number, because it can be changed into a prime (20115131021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6887284 + ... + 6890203.

It is an arithmetic number, because the mean of its divisors is an integer number (1784184696).

Almost surely, 2^20115131020 is an apocalyptic number.

20115131020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20115131020 is an abundant number, since it is smaller than the sum of its proper divisors (22705301684).

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

20115131020 is a wasteful number, since it uses less digits than its factorization.

20115131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13777569 (or 13777567 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 20115131020 its reverse (2013151102), we get a palindrome (22128282122).

The spelling of 20115131020 in words is "twenty billion, one hundred fifteen million, one hundred thirty-one thousand, twenty".