20015256442506 has 96 divisors (see below), whose sum is σ = 43876689679872. Its totient is φ = 6083260672320.

The previous prime is 20015256442501. The next prime is 20015256442513. The reversal of 20015256442506 is 60524465251002.

It is a happy number.

It is a super-2 number, since 2×20015256442506² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20015256442501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 563110171 + ... + 563145713.

It is an arithmetic number, because the mean of its divisors is an integer number (457048850832).

Almost surely, 2^{20015256442506} is an apocalyptic number.

20015256442506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20015256442506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21938344839936).

20015256442506 is an abundant number, since it is smaller than the sum of its proper divisors (23861433237366).

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

20015256442506 is a wasteful number, since it uses less digits than its factorization.

20015256442506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42348 (or 42335 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 20015256442506 in words is "twenty trillion, fifteen billion, two hundred fifty-six million, four hundred forty-two thousand, five hundred six".