20317730631 has 32 divisors (see below), whose sum is σ = 29928019968. Its totient is φ = 12158310240.

The previous prime is 20317730597. The next prime is 20317730633. The reversal of 20317730631 is 13603771302.

It is a happy number.

It is not a de Polignac number, because 20317730631 - 2²¹ = 20315633479 is a prime.

It is a super-2 number, since 2×20317730631² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 20317730592 and 20317730601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317730633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1074646 + ... + 1093388.

It is an arithmetic number, because the mean of its divisors is an integer number (935250624).

Almost surely, 2^20317730631 is an apocalyptic number.

20317730631 is a deficient number, since it is larger than the sum of its proper divisors (9610289337).

20317730631 is a wasteful number, since it uses less digits than its factorization.

20317730631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19171.

The product of its (nonzero) digits is 15876, while the sum is 33.

The spelling of 20317730631 in words is "twenty billion, three hundred seventeen million, seven hundred thirty thousand, six hundred thirty-one".