18132020 has 12 divisors (see below), whose sum is σ = 38077284. Its totient is φ = 7252800.

The previous prime is 18132019. The next prime is 18132029. The reversal of 18132020 is 2023181.

It can be written as a sum of positive squares in 2 ways, for example, as 4545424 + 13586596 = 2132^2 + 3686^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18132020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18132029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453281 + ... + 453320.

It is an arithmetic number, because the mean of its divisors is an integer number (3173107).

Almost surely, 2^18132020 is an apocalyptic number.

18132020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18132020 is an abundant number, since it is smaller than the sum of its proper divisors (19945264).

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

18132020 is a wasteful number, since it uses less digits than its factorization.

18132020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906610 (or 906608 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 18132020 is about 4258.1709688551. The cubic root of 18132020 is about 262.7133020628.

The spelling of 18132020 in words is "eighteen million, one hundred thirty-two thousand, twenty".