18738420 has 48 divisors (see below), whose sum is σ = 55556928. Its totient is φ = 4702720.

The previous prime is 18738373. The next prime is 18738439. The reversal of 18738420 is 2483781.

It is a super-2 number, since 2×18738420² = 702256768192800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8166 + ... + 10205.

It is an arithmetic number, because the mean of its divisors is an integer number (1157436).

Almost surely, 2^18738420 is an apocalyptic number.

18738420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18738420 is an abundant number, since it is smaller than the sum of its proper divisors (36818508).

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

18738420 is a wasteful number, since it uses less digits than its factorization.

18738420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18400 (or 18398 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 18738420 is about 4328.7896691801. The cubic root of 18738420 is about 265.6099395383.

The spelling of 18738420 in words is "eighteen million, seven hundred thirty-eight thousand, four hundred twenty".