20354945381 has 2 divisors, whose sum is σ = 20354945382. Its totient is φ = 20354945380.

The previous prime is 20354945357. The next prime is 20354945407. The reversal of 20354945381 is 18354945302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18413133025 + 1941812356 = 135695^2 + 44066^2 .

It is a cyclic number.

It is not a de Polignac number, because 20354945381 - 2²² = 20350751077 is a prime.

It is a super-2 number, since 2×20354945381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20354942381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177472690 + 10177472691.

It is an arithmetic number, because the mean of its divisors is an integer number (10177472691).

Almost surely, 2^20354945381 is an apocalyptic number.

It is an amenable number.

20354945381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354945381 is an equidigital number, since it uses as much as digits as its factorization.

20354945381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 20354945381 in words is "twenty billion, three hundred fifty-four million, nine hundred forty-five thousand, three hundred eighty-one".