20293906 has 4 divisors (see below), whose sum is σ = 30440862. Its totient is φ = 10146952.

The previous prime is 20293879. The next prime is 20293909. The reversal of 20293906 is 60939202.

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., 18447025 + 1846881 = 4295^2 + 1359^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20293909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5073475 + ... + 5073478.

Almost surely, 2^20293906 is an apocalyptic number.

20293906 is a deficient number, since it is larger than the sum of its proper divisors (10146956).

20293906 is a wasteful number, since it uses less digits than its factorization.

20293906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10146955.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20293906 is about 4504.8758029495. The cubic root of 20293906 is about 272.7649405414.

The spelling of 20293906 in words is "twenty million, two hundred ninety-three thousand, nine hundred six".