16220643 has 4 divisors (see below), whose sum is σ = 21627528. Its totient is φ = 10813760.

The previous prime is 16220641. The next prime is 16220671. The reversal of 16220643 is 34602261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16220643 - 2¹ = 16220641 is a prime.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (16220641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2703438 + ... + 2703443.

It is an arithmetic number, because the mean of its divisors is an integer number (5406882).

Almost surely, 2^16220643 is an apocalyptic number.

16220643 is a deficient number, since it is larger than the sum of its proper divisors (5406885).

16220643 is an equidigital number, since it uses as much as digits as its factorization.

16220643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406884.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 16220643 is about 4027.4859403851. The cubic root of 16220643 is about 253.1372291607.

The spelling of 16220643 in words is "sixteen million, two hundred twenty thousand, six hundred forty-three".