22420406 has 4 divisors (see below), whose sum is σ = 33630612. Its totient is φ = 11210202.

The previous prime is 22420403. The next prime is 22420421. The reversal of 22420406 is 60402422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60402422 = 2 ⋅30201211.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22420403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605100 + ... + 5605103.

It is an arithmetic number, because the mean of its divisors is an integer number (8407653).

Almost surely, 2^22420406 is an apocalyptic number.

22420406 is a deficient number, since it is larger than the sum of its proper divisors (11210206).

22420406 is a wasteful number, since it uses less digits than its factorization.

22420406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11210205.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 22420406 is about 4735.0191129498. The cubic root of 22420406 is about 281.9775228132.

Adding to 22420406 its reverse (60402422), we get a palindrome (82822828).

The spelling of 22420406 in words is "twenty-two million, four hundred twenty thousand, four hundred six".