20685615602106 has 64 divisors (see below), whose sum is σ = 51879163730688. Its totient is φ = 5352612115968.

The previous prime is 20685615602077. The next prime is 20685615602117. The reversal of 20685615602106 is 60120651658602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 357383731 + ... + 357441606.

It is an arithmetic number, because the mean of its divisors is an integer number (810611933292).

Almost surely, 2^{20685615602106} is an apocalyptic number.

20685615602106 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20685615602106 is an abundant number, since it is smaller than the sum of its proper divisors (31193548128582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20685615602106 is a wasteful number, since it uses less digits than its factorization.

20685615602106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714825415.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 20685615602106 in words is "twenty trillion, six hundred eighty-five billion, six hundred fifteen million, six hundred two thousand, one hundred six".