20531335120 has 40 divisors (see below), whose sum is σ = 48083813064. Its totient is φ = 8152584192.

The previous prime is 20531335073. The next prime is 20531335141. The reversal of 20531335120 is 2153313502.

It can be written as a sum of positive squares in 4 ways, for example, as 324144016 + 20207191104 = 18004^2 + 142152^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 925689 + ... + 947608.

Almost surely, 2^20531335120 is an apocalyptic number.

20531335120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20531335120 is an abundant number, since it is smaller than the sum of its proper divisors (27552477944).

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

20531335120 is a wasteful number, since it uses less digits than its factorization.

20531335120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873447 (or 1873441 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

Adding to 20531335120 its reverse (2153313502), we get a palindrome (22684648622).

The spelling of 20531335120 in words is "twenty billion, five hundred thirty-one million, three hundred thirty-five thousand, one hundred twenty".