18026420 has 24 divisors (see below), whose sum is σ = 38207400. Its totient is φ = 7143552.

The previous prime is 18026399. The next prime is 18026423. The reversal of 18026420 is 2462081.

It can be written as a sum of positive squares in 4 ways, for example, as 6990736 + 11035684 = 2644^2 + 3322^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18026423) 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, 1955 + ... + 6314.

It is an arithmetic number, because the mean of its divisors is an integer number (1591975).

Almost surely, 2^18026420 is an apocalyptic number.

18026420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18026420 is an abundant number, since it is smaller than the sum of its proper divisors (20180980).

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

18026420 is a wasteful number, since it uses less digits than its factorization.

18026420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8387 (or 8385 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18026420 is about 4245.7531722888. The cubic root of 18026420 is about 262.2022989374.

The spelling of 18026420 in words is "eighteen million, twenty-six thousand, four hundred twenty".