20331343520 has 24 divisors (see below), whose sum is σ = 48032799444. Its totient is φ = 8132537344.

The previous prime is 20331343517. The next prime is 20331343523. The reversal of 20331343520 is 2534313302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20331343517) and next prime (20331343523).

It can be written as a sum of positive squares in 2 ways, for example, as 20331337744 + 5776 = 142588^2 + 76^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20331343520.

It is not an unprimeable number, because it can be changed into a prime (20331343523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63535289 + ... + 63535608.

Almost surely, 2^20331343520 is an apocalyptic number.

20331343520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20331343520 is an abundant number, since it is smaller than the sum of its proper divisors (27701455924).

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

20331343520 is a wasteful number, since it uses less digits than its factorization.

20331343520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127070912 (or 127070904 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 20331343520 its reverse (2534313302), we get a palindrome (22865656822).

The spelling of 20331343520 in words is "twenty billion, three hundred thirty-one million, three hundred forty-three thousand, five hundred twenty".