20443207 has 4 divisors (see below), whose sum is σ = 20458000. Its totient is φ = 20428416.

The previous prime is 20443201. The next prime is 20443249. The reversal of 20443207 is 70234402.

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

It is a cyclic number.

It is not a de Polignac number, because 20443207 - 2¹¹ = 20441159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5082 + ... + 8167.

It is an arithmetic number, because the mean of its divisors is an integer number (5114500).

Almost surely, 2^20443207 is an apocalyptic number.

20443207 is a deficient number, since it is larger than the sum of its proper divisors (14793).

20443207 is a wasteful number, since it uses less digits than its factorization.

20443207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14792.

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 20443207 is about 4521.4164815907. The cubic root of 20443207 is about 273.4322117312.

Adding to 20443207 its reverse (70234402), we get a palindrome (90677609).

The spelling of 20443207 in words is "twenty million, four hundred forty-three thousand, two hundred seven".