20131322442 has 64 divisors (see below), whose sum is σ = 50220960768. Its totient is φ = 5226480000.

The previous prime is 20131322441. The next prime is 20131322443. The reversal of 20131322442 is 24422313102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20131322441) and next prime (20131322443).

It is not an unprimeable number, because it can be changed into a prime (20131322441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1118817 + ... + 1136667.

It is an arithmetic number, because the mean of its divisors is an integer number (784702512).

Almost surely, 2^20131322442 is an apocalyptic number.

20131322442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20131322442 is an abundant number, since it is smaller than the sum of its proper divisors (30089638326).

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

20131322442 is a wasteful number, since it uses less digits than its factorization.

20131322442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20315.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 20131322442 its reverse (24422313102), we get a palindrome (44553635544).

The spelling of 20131322442 in words is "twenty billion, one hundred thirty-one million, three hundred twenty-two thousand, four hundred forty-two".