20422906 has 20 divisors (see below), whose sum is σ = 35746362. Its totient is φ = 8750616.

The previous prime is 20422903. The next prime is 20422921. The reversal of 20422906 is 60922402.

It can be written as a sum of positive squares in only one way, i.e., 19882681 + 540225 = 4459^2 + 735^2 .

It is not an unprimeable number, because it can be changed into a prime (20422903) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2676 + ... + 6928.

Almost surely, 2^20422906 is an apocalyptic number.

20422906 is a deficient number, since it is larger than the sum of its proper divisors (15323456).

20422906 is an frugal number, since it uses more digits than its factorization.

20422906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283 (or 4262 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20422906 is about 4519.1709416662. The cubic root of 20422906 is about 273.3416717001.

The spelling of 20422906 in words is "twenty million, four hundred twenty-two thousand, nine hundred six".