20746247 has 2 divisors, whose sum is σ = 20746248. Its totient is φ = 20746246.

The previous prime is 20746241. The next prime is 20746249. The reversal of 20746247 is 74264702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20746247 - 2⁶ = 20746183 is a prime.

Together with 20746249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

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, 10373123 + 10373124.

It is an arithmetic number, because the mean of its divisors is an integer number (10373124).

Almost surely, 2^20746247 is an apocalyptic number.

20746247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20746247 is an equidigital number, since it uses as much as digits as its factorization.

20746247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 20746247 is about 4554.8048256758. The cubic root of 20746247 is about 274.7766649536.

The spelling of 20746247 in words is "twenty million, seven hundred forty-six thousand, two hundred forty-seven".