20145354973 has 2 divisors, whose sum is σ = 20145354974. Its totient is φ = 20145354972.

The previous prime is 20145354959. The next prime is 20145355007. The reversal of 20145354973 is 37945354102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19416192964 + 729162009 = 139342^2 + 27003^2 .

It is a cyclic number.

It is not a de Polignac number, because 20145354973 - 2²¹ = 20143257821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20145354953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072677486 + 10072677487.

It is an arithmetic number, because the mean of its divisors is an integer number (10072677487).

Almost surely, 2^20145354973 is an apocalyptic number.

It is an amenable number.

20145354973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145354973 is an equidigital number, since it uses as much as digits as its factorization.

20145354973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 43.

The spelling of 20145354973 in words is "twenty billion, one hundred forty-five million, three hundred fifty-four thousand, nine hundred seventy-three".