20397436317 has 24 divisors (see below), whose sum is σ = 31054023000. Its totient is φ = 12881651328.

The previous prime is 20397436313. The next prime is 20397436321. The reversal of 20397436317 is 71363479302.

It is a happy number.

20397436317 is a `hidden beast` number, since 2 + 0 + 3 + 9 + 7 + 4 + 3 + 631 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (20397436313) and next prime (20397436321).

It can be written as a sum of positive squares in 4 ways, for example, as 5895014841 + 14502421476 = 76779^2 + 120426^2 .

It is not a de Polignac number, because 20397436317 - 2² = 20397436313 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20397436313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 723442 + ... + 751107.

It is an arithmetic number, because the mean of its divisors is an integer number (1293917625).

Almost surely, 2^20397436317 is an apocalyptic number.

It is an amenable number.

20397436317 is a deficient number, since it is larger than the sum of its proper divisors (10656586683).

20397436317 is a wasteful number, since it uses less digits than its factorization.

20397436317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474637 (or 1474634 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 45.

The spelling of 20397436317 in words is "twenty billion, three hundred ninety-seven million, four hundred thirty-six thousand, three hundred seventeen".