20312249 has 2 divisors, whose sum is σ = 20312250. Its totient is φ = 20312248.

The previous prime is 20312239. The next prime is 20312293. The reversal of 20312249 is 94221302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15054400 + 5257849 = 3880^2 + 2293^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312249 - 2⁴ = 20312233 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20312219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156124 + 10156125.

It is an arithmetic number, because the mean of its divisors is an integer number (10156125).

Almost surely, 2^20312249 is an apocalyptic number.

It is an amenable number.

20312249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312249 is an equidigital number, since it uses as much as digits as its factorization.

20312249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20312249 is about 4506.9112482941. The cubic root of 20312249 is about 272.8470969058.

The spelling of 20312249 in words is "twenty million, three hundred twelve thousand, two hundred forty-nine".