20351533121504 has 48 divisors (see below), whose sum is σ = 43165654309008. Its totient is φ = 9389425554432.

The previous prime is 20351533121503. The next prime is 20351533121587. The reversal of 20351533121504 is 40512133515302.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351533121503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8258282 + ... + 10435625.

It is an arithmetic number, because the mean of its divisors is an integer number (899284464771).

Almost surely, 2^{20351533121504} is an apocalyptic number.

It is an amenable number.

20351533121504 is an abundant number, since it is smaller than the sum of its proper divisors (22814121187504).

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

20351533121504 is a wasteful number, since it uses less digits than its factorization.

20351533121504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18696547 (or 18696539 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 20351533121504 its reverse (40512133515302), we get a palindrome (60863666636806).

The spelling of 20351533121504 in words is "twenty trillion, three hundred fifty-one billion, five hundred thirty-three million, one hundred twenty-one thousand, five hundred four".