20331323140 has 72 divisors (see below), whose sum is σ = 44214604056. Its totient is φ = 7847424000.

The previous prime is 20331323113. The next prime is 20331323143. The reversal of 20331323140 is 4132313302.

It can be written as a sum of positive squares in 4 ways, for example, as 12810617856 + 7520705284 = 113184^2 + 86722^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331323143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12698340 + ... + 12699940.

It is an arithmetic number, because the mean of its divisors is an integer number (614091723).

Almost surely, 2^20331323140 is an apocalyptic number.

20331323140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20331323140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22107302028).

20331323140 is an abundant number, since it is smaller than the sum of its proper divisors (23883280916).

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

20331323140 is a wasteful number, since it uses less digits than its factorization.

20331323140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909 (or 1776 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 20331323140 its reverse (4132313302), we get a palindrome (24463636442).

The spelling of 20331323140 in words is "twenty billion, three hundred thirty-one million, three hundred twenty-three thousand, one hundred forty".