20135745552520 has 64 divisors (see below), whose sum is σ = 49003519446000. Its totient is φ = 7402270675968.

The previous prime is 20135745552511. The next prime is 20135745552553. The reversal of 20135745552520 is 2525554753102.

It can be written as a sum of positive squares in 8 ways, for example, as 13875431300676 + 6260314251844 = 3724974^2 + 2502062^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84428055 + ... + 84666214.

Almost surely, 2^{20135745552520} is an apocalyptic number.

20135745552520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20135745552520 is an abundant number, since it is smaller than the sum of its proper divisors (28867773893480).

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

20135745552520 is a wasteful number, since it uses less digits than its factorization.

20135745552520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169094522 (or 169094518 counting only the distinct ones).

The product of its (nonzero) digits is 2100000, while the sum is 46.

The spelling of 20135745552520 in words is "twenty trillion, one hundred thirty-five billion, seven hundred forty-five million, five hundred fifty-two thousand, five hundred twenty".