20117312464 has 10 divisors (see below), whose sum is σ = 38977292930. Its totient is φ = 10058656224.

The previous prime is 20117312431. The next prime is 20117312507. The reversal of 20117312464 is 46421371102.

It can be written as a sum of positive squares in only one way, i.e., 19686334864 + 430977600 = 140308^2 + 20760^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628665999 + ... + 628666030.

It is an arithmetic number, because the mean of its divisors is an integer number (3897729293).

Almost surely, 2^20117312464 is an apocalyptic number.

It is an amenable number.

20117312464 is a deficient number, since it is larger than the sum of its proper divisors (18859980466).

20117312464 is a wasteful number, since it uses less digits than its factorization.

20117312464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257332037 (or 1257332031 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 20117312464 its reverse (46421371102), we get a palindrome (66538683566).

The spelling of 20117312464 in words is "twenty billion, one hundred seventeen million, three hundred twelve thousand, four hundred sixty-four".