20422147 has 2 divisors, whose sum is σ = 20422148. Its totient is φ = 20422146.

The previous prime is 20422139. The next prime is 20422153. The reversal of 20422147 is 74122402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20422147 - 2³ = 20422139 is a prime.

It is not a weakly prime, because it can be changed into another prime (20422247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211073 + 10211074.

It is an arithmetic number, because the mean of its divisors is an integer number (10211074).

Almost surely, 2^20422147 is an apocalyptic number.

20422147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422147 is an equidigital number, since it uses as much as digits as its factorization.

20422147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 20422147 is about 4519.0869653062. The cubic root of 20422147 is about 273.3382854876.

Adding to 20422147 its reverse (74122402), we get a palindrome (94544549).

The spelling of 20422147 in words is "twenty million, four hundred twenty-two thousand, one hundred forty-seven".