20122147 has 2 divisors, whose sum is σ = 20122148. Its totient is φ = 20122146.

The previous prime is 20122133. The next prime is 20122153. The reversal of 20122147 is 74122102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20192147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061073 + 10061074.

It is an arithmetic number, because the mean of its divisors is an integer number (10061074).

Almost surely, 2^20122147 is an apocalyptic number.

20122147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122147 is an equidigital number, since it uses as much as digits as its factorization.

20122147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 20122147 is about 4485.7716170131. The cubic root of 20122147 is about 271.9932371084.

Adding to 20122147 its reverse (74122102), we get a palindrome (94244249).

The spelling of 20122147 in words is "twenty million, one hundred twenty-two thousand, one hundred forty-seven".