20511317410 has 16 divisors (see below), whose sum is σ = 37918219896. Its totient is φ = 7982782848.

The previous prime is 20511317381. The next prime is 20511317413. The reversal of 20511317410 is 1471311502.

It can be written as a sum of positive squares in 4 ways, for example, as 14715388249 + 5795929161 = 121307^2 + 76131^2 .

It is not an unprimeable number, because it can be changed into a prime (20511317413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27717627 + ... + 27718366.

Almost surely, 2^20511317410 is an apocalyptic number.

20511317410 is a deficient number, since it is larger than the sum of its proper divisors (17406902486).

20511317410 is a wasteful number, since it uses less digits than its factorization.

20511317410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55436037.

The product of its (nonzero) digits is 840, while the sum is 25.

Adding to 20511317410 its reverse (1471311502), we get a palindrome (21982628912).

The spelling of 20511317410 in words is "twenty billion, five hundred eleven million, three hundred seventeen thousand, four hundred ten".