20137343681 has 8 divisors (see below), whose sum is σ = 24784423104. Its totient is φ = 15932843280.

The previous prime is 20137343623. The next prime is 20137343713. The reversal of 20137343681 is 18634373102.

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 20137343681 - 2¹⁴ = 20137327297 is a prime.

It is a super-2 number, since 2×20137343681² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20137343621) 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, 110644655 + ... + 110644836.

It is an arithmetic number, because the mean of its divisors is an integer number (3098052888).

Almost surely, 2^20137343681 is an apocalyptic number.

It is an amenable number.

20137343681 is a deficient number, since it is larger than the sum of its proper divisors (4647079423).

20137343681 is a wasteful number, since it uses less digits than its factorization.

20137343681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221289511.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 20137343681 in words is "twenty billion, one hundred thirty-seven million, three hundred forty-three thousand, six hundred eighty-one".