18011420 has 36 divisors (see below), whose sum is σ = 44001720. Its totient is φ = 6175008.

The previous prime is 18011419. The next prime is 18011437. The reversal of 18011420 is 2411081.

It is a super-2 number, since 2×18011420² = 648822500832800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8210 + ... + 10169.

It is an arithmetic number, because the mean of its divisors is an integer number (1222270).

Almost surely, 2^18011420 is an apocalyptic number.

18011420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18011420 is an abundant number, since it is smaller than the sum of its proper divisors (25990300).

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

18011420 is a wasteful number, since it uses less digits than its factorization.

18011420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18402 (or 18393 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 18011420 is about 4243.9863336255. The cubic root of 18011420 is about 262.1295515312.

The spelling of 18011420 in words is "eighteen million, eleven thousand, four hundred twenty".