20142209 has 2 divisors, whose sum is σ = 20142210. Its totient is φ = 20142208.

The previous prime is 20142197. The next prime is 20142247. The reversal of 20142209 is 90224102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10080625 + 10061584 = 3175^2 + 3172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20142209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20142259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071104 + 10071105.

It is an arithmetic number, because the mean of its divisors is an integer number (10071105).

Almost surely, 2^20142209 is an apocalyptic number.

It is an amenable number.

20142209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20142209 is an equidigital number, since it uses as much as digits as its factorization.

20142209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20142209 is about 4488.0072415271. The cubic root of 20142209 is about 272.0836004918.

The spelling of 20142209 in words is "twenty million, one hundred forty-two thousand, two hundred nine".