20039597781309 has 12 divisors (see below), whose sum is σ = 29140354717500. Its totient is φ = 13270069223424.

The previous prime is 20039597781283. The next prime is 20039597781323. The reversal of 20039597781309 is 90318779593002.

20039597781309 is a `hidden beast` number, since 2 + 0 + 0 + 3 + 9 + 597 + 7 + 8 + 1 + 30 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6488202368025 + 13551395413284 = 2547195^2 + 3681222^2 .

It is not a de Polignac number, because 20039597781309 - 2²⁸ = 20039329345853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20039593781309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7471884484 + ... + 7471887165.

It is an arithmetic number, because the mean of its divisors is an integer number (2428362893125).

Almost surely, 2^{20039597781309} is an apocalyptic number.

It is an amenable number.

20039597781309 is a deficient number, since it is larger than the sum of its proper divisors (9100756936191).

20039597781309 is a wasteful number, since it uses less digits than its factorization.

20039597781309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14943771804 (or 14943771801 counting only the distinct ones).

The product of its (nonzero) digits is 25719120, while the sum is 63.

The spelling of 20039597781309 in words is "twenty trillion, thirty-nine billion, five hundred ninety-seven million, seven hundred eighty-one thousand, three hundred nine".