20315254520 has 64 divisors (see below), whose sum is σ = 49995325440. Its totient is φ = 7368016000.

The previous prime is 20315254511. The next prime is 20315254523. The reversal of 20315254520 is 2545251302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315254523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108245 + ... + 228795.

It is an arithmetic number, because the mean of its divisors is an integer number (781176960).

Almost surely, 2^20315254520 is an apocalyptic number.

20315254520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20315254520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24997662720).

20315254520 is an abundant number, since it is smaller than the sum of its proper divisors (29680070920).

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

20315254520 is a wasteful number, since it uses less digits than its factorization.

20315254520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120956 (or 120952 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The spelling of 20315254520 in words is "twenty billion, three hundred fifteen million, two hundred fifty-four thousand, five hundred twenty".