18420352 has 16 divisors (see below), whose sum is σ = 36697050. Its totient is φ = 9210112.

The previous prime is 18420349. The next prime is 18420361. The reversal of 18420352 is 25302481.

It can be written as a sum of positive squares in only one way, i.e., 16842816 + 1577536 = 4104^2 + 1256^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71827 + ... + 72082.

Almost surely, 2^18420352 is an apocalyptic number.

It is an amenable number.

18420352 is a deficient number, since it is larger than the sum of its proper divisors (18276698).

18420352 is an equidigital number, since it uses as much as digits as its factorization.

18420352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143923 (or 143911 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 18420352 is about 4291.8937545098. The cubic root of 18420352 is about 264.0985245974.

The spelling of 18420352 in words is "eighteen million, four hundred twenty thousand, three hundred fifty-two".