20860684381 has 2 divisors, whose sum is σ = 20860684382. Its totient is φ = 20860684380.

The previous prime is 20860684379. The next prime is 20860684409. The reversal of 20860684381 is 18348606802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19806058756 + 1054625625 = 140734^2 + 32475^2 .

It is a cyclic number.

It is not a de Polignac number, because 20860684381 - 2¹ = 20860684379 is a prime.

It is a super-2 number, since 2×20860684381² (a number of 21 digits) contains 22 as substring.

Together with 20860684379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20860684081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10430342190 + 10430342191.

It is an arithmetic number, because the mean of its divisors is an integer number (10430342191).

Almost surely, 2^20860684381 is an apocalyptic number.

It is an amenable number.

20860684381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20860684381 is an equidigital number, since it uses as much as digits as its factorization.

20860684381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 20860684381 in words is "twenty billion, eight hundred sixty million, six hundred eighty-four thousand, three hundred eighty-one".