20746249 has 2 divisors, whose sum is σ = 20746250. Its totient is φ = 20746248.

The previous prime is 20746247. The next prime is 20746277. The reversal of 20746249 is 94264702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 783225 = 4468^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 20746249 - 2¹ = 20746247 is a prime.

Together with 20746247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20746241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373124 + 10373125.

It is an arithmetic number, because the mean of its divisors is an integer number (10373125).

Almost surely, 2^20746249 is an apocalyptic number.

It is an amenable number.

20746249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20746249 is an equidigital number, since it uses as much as digits as its factorization.

20746249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 20746249 is about 4554.8050452242. The cubic root of 20746249 is about 274.7766737833.

The spelling of 20746249 in words is "twenty million, seven hundred forty-six thousand, two hundred forty-nine".