18220846 has 16 divisors (see below), whose sum is σ = 31874400. Its totient is φ = 7808640.

The previous prime is 18220841. The next prime is 18220847. The reversal of 18220846 is 64802281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12595 + ... + 13966.

It is an arithmetic number, because the mean of its divisors is an integer number (1992150).

Almost surely, 2^18220846 is an apocalyptic number.

18220846 is a deficient number, since it is larger than the sum of its proper divisors (13653554).

18220846 is an equidigital number, since it uses as much as digits as its factorization.

18220846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26584 (or 26570 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 18220846 is about 4268.5882912270. The cubic root of 18220846 is about 263.1416008957.

The spelling of 18220846 in words is "eighteen million, two hundred twenty thousand, eight hundred forty-six".