20402341549 has 2 divisors, whose sum is σ = 20402341550. Its totient is φ = 20402341548.

The previous prime is 20402341499. The next prime is 20402341559. The reversal of 20402341549 is 94514320402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20386699524 + 15642025 = 142782^2 + 3955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20402341549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20402341559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201170774 + 10201170775.

It is an arithmetic number, because the mean of its divisors is an integer number (10201170775).

Almost surely, 2^20402341549 is an apocalyptic number.

It is an amenable number.

20402341549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402341549 is an equidigital number, since it uses as much as digits as its factorization.

20402341549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 20402341549 in words is "twenty billion, four hundred two million, three hundred forty-one thousand, five hundred forty-nine".