20135521252 has 48 divisors (see below), whose sum is σ = 43956904320. Its totient is φ = 7840569600.

The previous prime is 20135521247. The next prime is 20135521271. The reversal of 20135521252 is 25212553102.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 20135521252.

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, 555624 + ... + 590752.

It is an arithmetic number, because the mean of its divisors is an integer number (915768840).

Almost surely, 2^20135521252 is an apocalyptic number.

20135521252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20135521252 is an abundant number, since it is smaller than the sum of its proper divisors (23821383068).

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

20135521252 is a wasteful number, since it uses less digits than its factorization.

20135521252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37012 (or 37010 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 20135521252 in words is "twenty billion, one hundred thirty-five million, five hundred twenty-one thousand, two hundred fifty-two".