20291715552 has 144 divisors (see below), whose sum is σ = 54647263440. Its totient is φ = 6591836160.

The previous prime is 20291715527. The next prime is 20291715553. The reversal of 20291715552 is 25551719202.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20291715552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20291715553) 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, 154898527 + ... + 154898657.

It is an arithmetic number, because the mean of its divisors is an integer number (379494885).

Almost surely, 2^20291715552 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 20291715552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27323631720).

20291715552 is an abundant number, since it is smaller than the sum of its proper divisors (34355547888).

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

20291715552 is a wasteful number, since it uses less digits than its factorization.

20291715552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 20291715552 in words is "twenty billion, two hundred ninety-one million, seven hundred fifteen thousand, five hundred fifty-two".