20685680157013 has 16 divisors (see below), whose sum is σ = 21608147502720. Its totient is φ = 19765140446656.

The previous prime is 20685680156969. The next prime is 20685680157029. The reversal of 20685680157013 is 31075108658602.

It is a cyclic number.

It is not a de Polignac number, because 20685680157013 - 2⁹ = 20685680156501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20685680157053) 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, 322390731 + ... + 322454887.

It is an arithmetic number, because the mean of its divisors is an integer number (1350509218920).

Almost surely, 2^{20685680157013} is an apocalyptic number.

20685680157013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20685680157013 is a deficient number, since it is larger than the sum of its proper divisors (922467345707).

20685680157013 is a wasteful number, since it uses less digits than its factorization.

20685680157013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78956.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 20685680157013 in words is "twenty trillion, six hundred eighty-five billion, six hundred eighty million, one hundred fifty-seven thousand, thirteen".