20004304356557 has 2 divisors, whose sum is σ = 20004304356558. Its totient is φ = 20004304356556.

The previous prime is 20004304356503. The next prime is 20004304356607. The reversal of 20004304356557 is 75565340340002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10095495830281 + 9908808526276 = 3177341^2 + 3147826^2 .

It is a cyclic number.

It is not a de Polignac number, because 20004304356557 - 2¹⁶ = 20004304291021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004304356457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002152178278 + 10002152178279.

It is an arithmetic number, because the mean of its divisors is an integer number (10002152178279).

Almost surely, 2^{20004304356557} is an apocalyptic number.

It is an amenable number.

20004304356557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004304356557 is an equidigital number, since it uses as much as digits as its factorization.

20004304356557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512000, while the sum is 44.

Adding to 20004304356557 its reverse (75565340340002), we get a palindrome (95569644696559).

The spelling of 20004304356557 in words is "twenty trillion, four billion, three hundred four million, three hundred fifty-six thousand, five hundred fifty-seven".