20121792552 has 320 divisors, whose sum is σ = 61788640320. Its totient is φ = 6092900352.

The previous prime is 20121792541. The next prime is 20121792553. The reversal of 20121792552 is 25529712102.

20121792552 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 17 + 92 + 552 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (20121792553) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 50684418 + ... + 50684814.

It is an arithmetic number, because the mean of its divisors is an integer number (193089501).

Almost surely, 2^20121792552 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 20121792552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30894320160).

20121792552 is an abundant number, since it is smaller than the sum of its proper divisors (41666847768).

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

20121792552 is a wasteful number, since it uses less digits than its factorization.

20121792552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582 (or 569 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 20121792552 in words is "twenty billion, one hundred twenty-one million, seven hundred ninety-two thousand, five hundred fifty-two".