20540247251267 has 24 divisors (see below), whose sum is σ = 21315061090512. Its totient is φ = 19790283833600.

The previous prime is 20540247251239. The next prime is 20540247251269. The reversal of 20540247251267 is 76215274204502.

It is not a de Polignac number, because 20540247251267 - 2⁶ = 20540247251203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (20540247251269) 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 23 ways as a sum of consecutive naturals, for example, 51321167 + ... + 51719847.

It is an arithmetic number, because the mean of its divisors is an integer number (888127545438).

Almost surely, 2^{20540247251267} is an apocalyptic number.

20540247251267 is a deficient number, since it is larger than the sum of its proper divisors (774813839245).

20540247251267 is an equidigital number, since it uses as much as digits as its factorization.

20540247251267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399139 (or 399092 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 47.

The spelling of 20540247251267 in words is "twenty trillion, five hundred forty billion, two hundred forty-seven million, two hundred fifty-one thousand, two hundred sixty-seven".