20354621369 has 2 divisors, whose sum is σ = 20354621370. Its totient is φ = 20354621368.

The previous prime is 20354621333. The next prime is 20354621429. The reversal of 20354621369 is 96312645302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16323895225 + 4030726144 = 127765^2 + 63488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20354621369 is a prime.

It is a super-2 number, since 2×20354621369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20354621269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177310684 + 10177310685.

It is an arithmetic number, because the mean of its divisors is an integer number (10177310685).

Almost surely, 2^20354621369 is an apocalyptic number.

It is an amenable number.

20354621369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354621369 is an equidigital number, since it uses as much as digits as its factorization.

20354621369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 20354621369 in words is "twenty billion, three hundred fifty-four million, six hundred twenty-one thousand, three hundred sixty-nine".