20973075491181 has 16 divisors (see below), whose sum is σ = 30622285140480. Its totient is φ = 12662624211120.

The previous prime is 20973075491171. The next prime is 20973075491183. The reversal of 20973075491181 is 18119457037902.

It is not a de Polignac number, because 20973075491181 - 2⁹ = 20973075490669 is a prime.

It is a super-2 number, since 2×20973075491181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973075491183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1208256991 + ... + 1208274348.

It is an arithmetic number, because the mean of its divisors is an integer number (1913892821280).

Almost surely, 2^{20973075491181} is an apocalyptic number.

It is an amenable number.

20973075491181 is a deficient number, since it is larger than the sum of its proper divisors (9649209649299).

20973075491181 is a wasteful number, since it uses less digits than its factorization.

20973075491181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416531616.

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 20973075491181 in words is "twenty trillion, nine hundred seventy-three billion, seventy-five million, four hundred ninety-one thousand, one hundred eighty-one".