20973698181 has 12 divisors (see below), whose sum is σ = 30449127852. Its totient is φ = 13911487296.

The previous prime is 20973698177. The next prime is 20973698203. The reversal of 20973698181 is 18189637902.

It can be written as a sum of positive squares in 2 ways, for example, as 13776890625 + 7196807556 = 117375^2 + 84834^2 .

It is not a de Polignac number, because 20973698181 - 2² = 20973698177 is a prime.

It is a super-2 number, since 2×20973698181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973698171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5912976 + ... + 5916521.

It is an arithmetic number, because the mean of its divisors is an integer number (2537427321).

Almost surely, 2^20973698181 is an apocalyptic number.

It is an amenable number.

20973698181 is a deficient number, since it is larger than the sum of its proper divisors (9475429671).

20973698181 is a wasteful number, since it uses less digits than its factorization.

20973698181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11829700 (or 11829697 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 20973698181 in words is "twenty billion, nine hundred seventy-three million, six hundred ninety-eight thousand, one hundred eighty-one".