16820743 has 2 divisors, whose sum is σ = 16820744. Its totient is φ = 16820742.

The previous prime is 16820729. The next prime is 16820761. The reversal of 16820743 is 34702861.

It is a weak prime.

It is an emirp because it is prime and its reverse (34702861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16820743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16823743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8410371 + 8410372.

It is an arithmetic number, because the mean of its divisors is an integer number (8410372).

Almost surely, 2^16820743 is an apocalyptic number.

16820743 is a deficient number, since it is larger than the sum of its proper divisors (1).

16820743 is an equidigital number, since it uses as much as digits as its factorization.

16820743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 16820743 is about 4101.3099126986. The cubic root of 16820743 is about 256.2211985873.

The spelling of 16820743 in words is "sixteen million, eight hundred twenty thousand, seven hundred forty-three".