20309609431288 has 32 divisors (see below), whose sum is σ = 38155272048000. Its totient is φ = 10134888070752.

The previous prime is 20309609431229. The next prime is 20309609431289. The reversal of 20309609431288 is 88213490690302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20309609431289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7995663 + ... + 10224961.

It is an arithmetic number, because the mean of its divisors is an integer number (1192352251500).

Almost surely, 2^{20309609431288} is an apocalyptic number.

It is an amenable number.

20309609431288 is a deficient number, since it is larger than the sum of its proper divisors (17845662616712).

20309609431288 is a wasteful number, since it uses less digits than its factorization.

20309609431288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231539 (or 2231535 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 20309609431288 in words is "twenty trillion, three hundred nine billion, six hundred nine million, four hundred thirty-one thousand, two hundred eighty-eight".