20422251 has 12 divisors (see below), whose sum is σ = 29983200. Its totient is φ = 13391280.

The previous prime is 20422249. The next prime is 20422267. The reversal of 20422251 is 15222402.

It is not a de Polignac number, because 20422251 - 2¹ = 20422249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20422651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18051 + ... + 19148.

It is an arithmetic number, because the mean of its divisors is an integer number (2498600).

Almost surely, 2^20422251 is an apocalyptic number.

20422251 is a deficient number, since it is larger than the sum of its proper divisors (9560949).

20422251 is a wasteful number, since it uses less digits than its factorization.

20422251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37266 (or 37263 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20422251 is about 4519.0984720406. The cubic root of 20422251 is about 273.3387494796.

Adding to 20422251 its reverse (15222402), we get a palindrome (35644653).

The spelling of 20422251 in words is "twenty million, four hundred twenty-two thousand, two hundred fifty-one".