20680135507 has 2 divisors, whose sum is σ = 20680135508. Its totient is φ = 20680135506.

The previous prime is 20680135459. The next prime is 20680135523. The reversal of 20680135507 is 70553108602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20680135507 is a prime.

It is not a weakly prime, because it can be changed into another prime (20680135547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10340067753 + 10340067754.

It is an arithmetic number, because the mean of its divisors is an integer number (10340067754).

Almost surely, 2^20680135507 is an apocalyptic number.

20680135507 is a deficient number, since it is larger than the sum of its proper divisors (1).

20680135507 is an equidigital number, since it uses as much as digits as its factorization.

20680135507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 20680135507 in words is "twenty billion, six hundred eighty million, one hundred thirty-five thousand, five hundred seven".