20863247 has 2 divisors, whose sum is σ = 20863248. Its totient is φ = 20863246.

The previous prime is 20863229. The next prime is 20863289. The reversal of 20863247 is 74236802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20863247 - 2²⁰ = 19814671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20863207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10431623 + 10431624.

It is an arithmetic number, because the mean of its divisors is an integer number (10431624).

Almost surely, 2^20863247 is an apocalyptic number.

20863247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20863247 is an equidigital number, since it uses as much as digits as its factorization.

20863247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20863247 is about 4567.6303484411. The cubic root of 20863247 is about 275.2922380936.

The spelling of 20863247 in words is "twenty million, eight hundred sixty-three thousand, two hundred forty-seven".