20142247 has 2 divisors, whose sum is σ = 20142248. Its totient is φ = 20142246.

The previous prime is 20142209. The next prime is 20142251. The reversal of 20142247 is 74224102.

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-20142247 is a prime.

It is a super-2 number, since 2×20142247² = 811420228418018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20142257) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071123 + 10071124.

It is an arithmetic number, because the mean of its divisors is an integer number (10071124).

Almost surely, 2^20142247 is an apocalyptic number.

20142247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20142247 is an equidigital number, since it uses as much as digits as its factorization.

20142247 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 20142247 is about 4488.0114750299. The cubic root of 20142247 is about 272.0837715947.

Adding to 20142247 its reverse (74224102), we get a palindrome (94366349).

The spelling of 20142247 in words is "twenty million, one hundred forty-two thousand, two hundred forty-seven".