20404064526613 has 4 divisors (see below), whose sum is σ = 20404073871340. Its totient is φ = 20404055181888.

The previous prime is 20404064526553. The next prime is 20404064526667. The reversal of 20404064526613 is 31662546040402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12733064628964 + 7670999897649 = 3568342^2 + 2769657^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404064526613 - 2⁹ = 20404064526101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20404064526613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404064526913) 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 in 3 ways as a sum of consecutive naturals, for example, 544381 + ... + 6411277.

It is an arithmetic number, because the mean of its divisors is an integer number (5101018467835).

Almost surely, 2^{20404064526613} is an apocalyptic number.

It is an amenable number.

20404064526613 is a deficient number, since it is larger than the sum of its proper divisors (9344727).

20404064526613 is an equidigital number, since it uses as much as digits as its factorization.

20404064526613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9344726.

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 20404064526613 in words is "twenty trillion, four hundred four billion, sixty-four million, five hundred twenty-six thousand, six hundred thirteen".