20326156381 has 2 divisors, whose sum is σ = 20326156382. Its totient is φ = 20326156380.

The previous prime is 20326156303. The next prime is 20326156429. The reversal of 20326156381 is 18365162302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20325064356 + 1092025 = 142566^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 20326156381 - 2⁹ = 20326155869 is a prime.

It is a super-2 number, since 2×20326156381² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20326156381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321156381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10163078190 + 10163078191.

It is an arithmetic number, because the mean of its divisors is an integer number (10163078191).

Almost surely, 2^20326156381 is an apocalyptic number.

It is an amenable number.

20326156381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20326156381 is an equidigital number, since it uses as much as digits as its factorization.

20326156381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 20326156381 in words is "twenty billion, three hundred twenty-six million, one hundred fifty-six thousand, three hundred eighty-one".