20390523436009 has 2 divisors, whose sum is σ = 20390523436010. Its totient is φ = 20390523436008.

The previous prime is 20390523435983. The next prime is 20390523436021. The reversal of 20390523436009 is 90063432509302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14258387456784 + 6132135979225 = 3776028^2 + 2476315^2 .

It is a cyclic number.

It is not a de Polignac number, because 20390523436009 - 2¹³ = 20390523427817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20390523436009.

It is not a weakly prime, because it can be changed into another prime (20390523436099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10195261718004 + 10195261718005.

It is an arithmetic number, because the mean of its divisors is an integer number (10195261718005).

Almost surely, 2^{20390523436009} is an apocalyptic number.

It is an amenable number.

20390523436009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20390523436009 is an equidigital number, since it uses as much as digits as its factorization.

20390523436009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 46.

The spelling of 20390523436009 in words is "twenty trillion, three hundred ninety billion, five hundred twenty-three million, four hundred thirty-six thousand, nine".