20423206 has 4 divisors (see below), whose sum is σ = 30634812. Its totient is φ = 10211602.

The previous prime is 20423201. The next prime is 20423209. The reversal of 20423206 is 60232402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60232402 = 2 ⋅30116201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105800 + ... + 5105803.

It is an arithmetic number, because the mean of its divisors is an integer number (7658703).

Almost surely, 2^20423206 is an apocalyptic number.

20423206 is a deficient number, since it is larger than the sum of its proper divisors (10211606).

20423206 is a wasteful number, since it uses less digits than its factorization.

20423206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10211605.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20423206 is about 4519.2041334731. The cubic root of 20423206 is about 273.3430101009.

Adding to 20423206 its reverse (60232402), we get a palindrome (80655608).

The spelling of 20423206 in words is "twenty million, four hundred twenty-three thousand, two hundred six".