20255646131520 has 112 divisors (see below), whose sum is σ = 64521161694528. Its totient is φ = 5383911075840.

The previous prime is 20255646131503. The next prime is 20255646131533. The reversal of 20255646131520 is 2513164655202.

It is a super-2 number, since 2×20255646131520² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34069501 + ... + 34658940.

It is an arithmetic number, because the mean of its divisors is an integer number (576081800844).

Almost surely, 2^{20255646131520} is an apocalyptic number.

20255646131520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20255646131520 is an abundant number, since it is smaller than the sum of its proper divisors (44265515563008).

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

20255646131520 is a wasteful number, since it uses less digits than its factorization.

20255646131520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68728768 (or 68728758 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 20255646131520 in words is "twenty trillion, two hundred fifty-five billion, six hundred forty-six million, one hundred thirty-one thousand, five hundred twenty".