20501519952 has 80 divisors (see below), whose sum is σ = 54492137280. Its totient is φ = 6637900800.

The previous prime is 20501519923. The next prime is 20501519953. The reversal of 20501519952 is 25991510502.

It is a self number, because there is not a number n which added to its sum of digits gives 20501519952.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20501519953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427927 + ... + 473417.

It is an arithmetic number, because the mean of its divisors is an integer number (681151716).

Almost surely, 2^20501519952 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 20501519952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27246068640).

20501519952 is an abundant number, since it is smaller than the sum of its proper divisors (33990617328).

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

20501519952 is a wasteful number, since it uses less digits than its factorization.

20501519952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45772 (or 45766 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 39.

The spelling of 20501519952 in words is "twenty billion, five hundred one million, five hundred nineteen thousand, nine hundred fifty-two".