16720243 has 2 divisors, whose sum is σ = 16720244. Its totient is φ = 16720242.

The previous prime is 16720217. The next prime is 16720279. The reversal of 16720243 is 34202761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16720243 - 2¹⁷ = 16589171 is a prime.

It is not a weakly prime, because it can be changed into another prime (16720043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360121 + 8360122.

It is an arithmetic number, because the mean of its divisors is an integer number (8360122).

Almost surely, 2^16720243 is an apocalyptic number.

16720243 is a deficient number, since it is larger than the sum of its proper divisors (1).

16720243 is an equidigital number, since it uses as much as digits as its factorization.

16720243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 16720243 is about 4089.0393737405. The cubic root of 16720243 is about 255.7098917001.

The spelling of 16720243 in words is "sixteen million, seven hundred twenty thousand, two hundred forty-three".