20408222 has 16 divisors (see below), whose sum is σ = 32044032. Its totient is φ = 9729720.

The previous prime is 20408191. The next prime is 20408231. The reversal of 20408222 is 22280402.

It is a junction number, because it is equal to n+sod(n) for n = 20408194 and 20408203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21947 + ... + 22857.

It is an arithmetic number, because the mean of its divisors is an integer number (2002752).

Almost surely, 2^20408222 is an apocalyptic number.

20408222 is a deficient number, since it is larger than the sum of its proper divisors (11635810).

20408222 is a wasteful number, since it uses less digits than its factorization.

20408222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 20408222 is about 4517.5460152609. The cubic root of 20408222 is about 273.2761454156.

Adding to 20408222 its reverse (22280402), we get a palindrome (42688624).

The spelling of 20408222 in words is "twenty million, four hundred eight thousand, two hundred twenty-two".