20157891709267 has 32 divisors (see below), whose sum is σ = 22126883788800. Its totient is φ = 18250157396352.

The previous prime is 20157891709243. The next prime is 20157891709363. The reversal of 20157891709267 is 76290719875102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20157891709267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20157891709199 and 20157891709208.

It is not an unprimeable number, because it can be changed into a prime (20157891709367) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 628562709 + ... + 628594777.

It is an arithmetic number, because the mean of its divisors is an integer number (691465118400).

Almost surely, 2^{20157891709267} is an apocalyptic number.

20157891709267 is a deficient number, since it is larger than the sum of its proper divisors (1968992079533).

20157891709267 is a wasteful number, since it uses less digits than its factorization.

20157891709267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33987.

The product of its (nonzero) digits is 26671680, while the sum is 64.

The spelling of 20157891709267 in words is "twenty trillion, one hundred fifty-seven billion, eight hundred ninety-one million, seven hundred nine thousand, two hundred sixty-seven".