20346727381 has 4 divisors (see below), whose sum is σ = 21048338700. Its totient is φ = 19645116064.

The previous prime is 20346727367. The next prime is 20346727399. The reversal of 20346727381 is 18372764302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18372764302 = 2 ⋅9186382151.

It can be written as a sum of positive squares in 2 ways, for example, as 13626826756 + 6719900625 = 116734^2 + 81975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20346727381 is a prime.

It is a super-2 number, since 2×20346727381² (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 (20346727351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350805616 + ... + 350805673.

It is an arithmetic number, because the mean of its divisors is an integer number (5262084675).

Almost surely, 2^20346727381 is an apocalyptic number.

It is an amenable number.

20346727381 is a deficient number, since it is larger than the sum of its proper divisors (701611319).

20346727381 is an equidigital number, since it uses as much as digits as its factorization.

20346727381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701611318.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 20346727381 in words is "twenty billion, three hundred forty-six million, seven hundred twenty-seven thousand, three hundred eighty-one".