20328705 has 16 divisors (see below), whose sum is σ = 36140160. Its totient is φ = 10841904.

The previous prime is 20328701. The next prime is 20328713. The reversal of 20328705 is 50782302.

It is not a de Polignac number, because 20328705 - 2² = 20328701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20328701) 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, 75157 + ... + 75426.

It is an arithmetic number, because the mean of its divisors is an integer number (2258760).

Almost surely, 2^20328705 is an apocalyptic number.

It is an amenable number.

20328705 is a deficient number, since it is larger than the sum of its proper divisors (15811455).

20328705 is a wasteful number, since it uses less digits than its factorization.

20328705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150597 (or 150591 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20328705 is about 4508.7365192479. The cubic root of 20328705 is about 272.9207595162.

The spelling of 20328705 in words is "twenty million, three hundred twenty-eight thousand, seven hundred five".