20131455120 has 80 divisors (see below), whose sum is σ = 71322875520. Its totient is φ = 4601475072.

The previous prime is 20131455119. The next prime is 20131455121. The reversal of 20131455120 is 2155413102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20131455119) and next prime (20131455121).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20131455121) 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 15 ways as a sum of consecutive naturals, for example, 5989825 + ... + 5993184.

It is an arithmetic number, because the mean of its divisors is an integer number (891535944).

Almost surely, 2^20131455120 is an apocalyptic number.

20131455120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20131455120 is an abundant number, since it is smaller than the sum of its proper divisors (51191420400).

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

20131455120 is a wasteful number, since it uses less digits than its factorization.

20131455120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11983032 (or 11983026 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 20131455120 its reverse (2155413102), we get a palindrome (22286868222).

The spelling of 20131455120 in words is "twenty billion, one hundred thirty-one million, four hundred fifty-five thousand, one hundred twenty".