20504043601 has 2 divisors, whose sum is σ = 20504043602. Its totient is φ = 20504043600.

The previous prime is 20504043577. The next prime is 20504043607. The reversal of 20504043601 is 10634040502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20299410576 + 204633025 = 142476^2 + 14305^2 .

It is a cyclic number.

It is not a de Polignac number, because 20504043601 - 2¹¹ = 20504041553 is a prime.

It is not a weakly prime, because it can be changed into another prime (20504043607) 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, 10252021800 + 10252021801.

It is an arithmetic number, because the mean of its divisors is an integer number (10252021801).

Almost surely, 2^20504043601 is an apocalyptic number.

It is an amenable number.

20504043601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504043601 is an equidigital number, since it uses as much as digits as its factorization.

20504043601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 20504043601 in words is "twenty billion, five hundred four million, forty-three thousand, six hundred one".