20297993181 has 8 divisors (see below), whose sum is σ = 27064669344. Its totient is φ = 13531656240.

The previous prime is 20297993161. The next prime is 20297993231. The reversal of 20297993181 is 18139979202.

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

It is not a de Polignac number, because 20297993181 - 2¹⁸ = 20297731037 is a prime.

It is a super-2 number, since 2×20297993181² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297993161) 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, 139795 + ... + 245231.

It is an arithmetic number, because the mean of its divisors is an integer number (3383083668).

Almost surely, 2^20297993181 is an apocalyptic number.

It is an amenable number.

20297993181 is a deficient number, since it is larger than the sum of its proper divisors (6766676163).

20297993181 is a wasteful number, since it uses less digits than its factorization.

20297993181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169611.

The product of its (nonzero) digits is 489888, while the sum is 51.

The spelling of 20297993181 in words is "twenty billion, two hundred ninety-seven million, nine hundred ninety-three thousand, one hundred eighty-one".