18220746 has 16 divisors (see below), whose sum is σ = 37617408. Its totient is φ = 5877600.

The previous prime is 18220733. The next prime is 18220747. The reversal of 18220746 is 64702281.

It is not an unprimeable number, because it can be changed into a prime (18220747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48795 + ... + 49166.

It is an arithmetic number, because the mean of its divisors is an integer number (2351088).

Almost surely, 2^18220746 is an apocalyptic number.

18220746 is an abundant number, since it is smaller than the sum of its proper divisors (19396662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18220746 is a wasteful number, since it uses less digits than its factorization.

18220746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97997.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 18220746 is about 4268.5765777364. The cubic root of 18220746 is about 263.1411195019.

The spelling of 18220746 in words is "eighteen million, two hundred twenty thousand, seven hundred forty-six".