20320260631 has 16 divisors (see below), whose sum is σ = 22679677440. Its totient is φ = 18051022080.

The previous prime is 20320260617. The next prime is 20320260659. The reversal of 20320260631 is 13606202302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20320260631 - 2⁷ = 20320260503 is a prime.

It is a super-2 number, since 2×20320260631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20320260596 and 20320260605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320260671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36241 + ... + 204826.

It is an arithmetic number, because the mean of its divisors is an integer number (1417479840).

Almost surely, 2^20320260631 is an apocalyptic number.

20320260631 is a deficient number, since it is larger than the sum of its proper divisors (2359416809).

20320260631 is a wasteful number, since it uses less digits than its factorization.

20320260631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241254.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 20320260631 its reverse (13606202302), we get a palindrome (33926462933).

The spelling of 20320260631 in words is "twenty billion, three hundred twenty million, two hundred sixty thousand, six hundred thirty-one".