20046608381 has 2 divisors, whose sum is σ = 20046608382. Its totient is φ = 20046608380.

The previous prime is 20046608363. The next prime is 20046608383. The reversal of 20046608381 is 18380664002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18478052356 + 1568556025 = 135934^2 + 39605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20046608381 is a prime.

It is a super-2 number, since 2×20046608381² (a number of 21 digits) contains 22 as substring.

Together with 20046608383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20046608383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023304190 + 10023304191.

It is an arithmetic number, because the mean of its divisors is an integer number (10023304191).

Almost surely, 2^20046608381 is an apocalyptic number.

It is an amenable number.

20046608381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20046608381 is an equidigital number, since it uses as much as digits as its factorization.

20046608381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 20046608381 in words is "twenty billion, forty-six million, six hundred eight thousand, three hundred eighty-one".