20743724401 has 2 divisors, whose sum is σ = 20743724402. Its totient is φ = 20743724400.

The previous prime is 20743724387. The next prime is 20743724461. The reversal of 20743724401 is 10442734702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19258778176 + 1484946225 = 138776^2 + 38535^2 .

It is a cyclic number.

It is not a de Polignac number, because 20743724401 - 2²⁹ = 20206853489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20743724461) 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, 10371862200 + 10371862201.

It is an arithmetic number, because the mean of its divisors is an integer number (10371862201).

Almost surely, 2^20743724401 is an apocalyptic number.

It is an amenable number.

20743724401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20743724401 is an equidigital number, since it uses as much as digits as its factorization.

20743724401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 34.

The spelling of 20743724401 in words is "twenty billion, seven hundred forty-three million, seven hundred twenty-four thousand, four hundred one".