20015256747531 has 32 divisors (see below), whose sum is σ = 27546146191872. Its totient is φ = 12920842388480.

The previous prime is 20015256747511. The next prime is 20015256747569. The reversal of 20015256747531 is 13574765251002.

It is a cyclic number.

It is not a de Polignac number, because 20015256747531 - 2⁶ = 20015256747467 is a prime.

It is a super-2 number, since 2×20015256747531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20015256747511) 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 31 ways as a sum of consecutive naturals, for example, 12201211 + ... + 13744091.

It is an arithmetic number, because the mean of its divisors is an integer number (860817068496).

Almost surely, 2^{20015256747531} is an apocalyptic number.

20015256747531 is a deficient number, since it is larger than the sum of its proper divisors (7530889444341).

20015256747531 is a wasteful number, since it uses less digits than its factorization.

20015256747531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544003.

The product of its (nonzero) digits is 1764000, while the sum is 48.

The spelling of 20015256747531 in words is "twenty trillion, fifteen billion, two hundred fifty-six million, seven hundred forty-seven thousand, five hundred thirty-one".