20765906 has 16 divisors (see below), whose sum is σ = 36326400. Its totient is φ = 8899380.

The previous prime is 20765893. The next prime is 20765909. The reversal of 20765906 is 60956702.

It is not an unprimeable number, because it can be changed into a prime (20765909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14450 + ... + 15821.

It is an arithmetic number, because the mean of its divisors is an integer number (2270400).

Almost surely, 2^20765906 is an apocalyptic number.

20765906 is a deficient number, since it is larger than the sum of its proper divisors (15560494).

20765906 is an equidigital number, since it uses as much as digits as its factorization.

20765906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30294 (or 30280 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 20765906 is about 4556.9623654360. The cubic root of 20765906 is about 274.8634297085.

The spelling of 20765906 in words is "twenty million, seven hundred sixty-five thousand, nine hundred six".