18420735 has 16 divisors (see below), whose sum is σ = 29528064. Its totient is φ = 9806112.

The previous prime is 18420691. The next prime is 18420739. The reversal of 18420735 is 53702481.

It is not a de Polignac number, because 18420735 - 2⁷ = 18420607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12234 + ... + 13656.

It is an arithmetic number, because the mean of its divisors is an integer number (1845504).

Almost surely, 2^18420735 is an apocalyptic number.

18420735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18420735 is a deficient number, since it is larger than the sum of its proper divisors (11107329).

18420735 is a wasteful number, since it uses less digits than its factorization.

18420735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 18420735 is about 4291.9383732761. The cubic root of 18420735 is about 264.1003549829.

The spelling of 18420735 in words is "eighteen million, four hundred twenty thousand, seven hundred thirty-five".