20905696 has 24 divisors (see below), whose sum is σ = 47038320. Its totient is φ = 8959488.

The previous prime is 20905679. The next prime is 20905711. The reversal of 20905696 is 69650902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46441 + ... + 46888.

It is an arithmetic number, because the mean of its divisors is an integer number (1959930).

Almost surely, 2^20905696 is an apocalyptic number.

It is an amenable number.

20905696 is an abundant number, since it is smaller than the sum of its proper divisors (26132624).

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

20905696 is an equidigital number, since it uses as much as digits as its factorization.

20905696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93346 (or 93338 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 20905696 is about 4572.2747074077. The cubic root of 20905696 is about 275.4788176111.

The spelling of 20905696 in words is "twenty million, nine hundred five thousand, six hundred ninety-six".