20312072560 has 80 divisors (see below), whose sum is σ = 50959550880. Its totient is φ = 7484912640.

The previous prime is 20312072477. The next prime is 20312072563. The reversal of 20312072560 is 6527021302.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312072563) 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, 510175 + ... + 548545.

It is an arithmetic number, because the mean of its divisors is an integer number (636994386).

Almost surely, 2^20312072560 is an apocalyptic number.

20312072560 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 20312072560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25479775440).

20312072560 is an abundant number, since it is smaller than the sum of its proper divisors (30647478320).

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

20312072560 is a wasteful number, since it uses less digits than its factorization.

20312072560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38906 (or 38900 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 20312072560 its reverse (6527021302), we get a palindrome (26839093862).

The spelling of 20312072560 in words is "twenty billion, three hundred twelve million, seventy-two thousand, five hundred sixty".