20281172191 has 8 divisors (see below), whose sum is σ = 23926175744. Its totient is φ = 16823091960.

The previous prime is 20281172189. The next prime is 20281172203. The reversal of 20281172191 is 19127118202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20281172191 - 2¹ = 20281172189 is a prime.

It is a super-2 number, since 2×20281172191² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20281172111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46730595 + ... + 46731028.

It is an arithmetic number, because the mean of its divisors is an integer number (2990771968).

Almost surely, 2^20281172191 is an apocalyptic number.

20281172191 is a deficient number, since it is larger than the sum of its proper divisors (3645003553).

20281172191 is an equidigital number, since it uses as much as digits as its factorization.

20281172191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93461661.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 20281172191 in words is "twenty billion, two hundred eighty-one million, one hundred seventy-two thousand, one hundred ninety-one".