20395906 has 4 divisors (see below), whose sum is σ = 30593862. Its totient is φ = 10197952.

The previous prime is 20395897. The next prime is 20395919. The reversal of 20395906 is 60959302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10530025 + 9865881 = 3245^2 + 3141^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5098975 + ... + 5098978.

Almost surely, 2^20395906 is an apocalyptic number.

20395906 is a deficient number, since it is larger than the sum of its proper divisors (10197956).

20395906 is a wasteful number, since it uses less digits than its factorization.

20395906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10197955.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 20395906 is about 4516.1826800961. The cubic root of 20395906 is about 273.2211619180.

The spelling of 20395906 in words is "twenty million, three hundred ninety-five thousand, nine hundred six".