20145816252 has 72 divisors (see below), whose sum is σ = 52305293040. Its totient is φ = 6534017280.

The previous prime is 20145816241. The next prime is 20145816259. The reversal of 20145816252 is 25261854102.

20145816252 is a `hidden beast` number, since 2 + 0 + 14 + 581 + 62 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145816259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 541398 + ... + 577410.

Almost surely, 2^20145816252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20145816252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26152646520).

20145816252 is an abundant number, since it is smaller than the sum of its proper divisors (32159476788).

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

20145816252 is a wasteful number, since it uses less digits than its factorization.

20145816252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36443 (or 36438 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 20145816252 in words is "twenty billion, one hundred forty-five million, eight hundred sixteen thousand, two hundred fifty-two".