18312080 has 20 divisors (see below), whose sum is σ = 42575772. Its totient is φ = 7324800.

The previous prime is 18312059. The next prime is 18312101. The reversal of 18312080 is 8021381.

It is an interprime number because it is at equal distance from previous prime (18312059) and next prime (18312101).

It can be written as a sum of positive squares in 2 ways, for example, as 12475024 + 5837056 = 3532^2 + 2416^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114371 + ... + 114530.

Almost surely, 2^18312080 is an apocalyptic number.

18312080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18312080 is an abundant number, since it is smaller than the sum of its proper divisors (24263692).

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

18312080 is a wasteful number, since it uses less digits than its factorization.

18312080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228914 (or 228908 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 18312080 is about 4279.2616185506. The cubic root of 18312080 is about 263.5800639338.

The spelling of 18312080 in words is "eighteen million, three hundred twelve thousand, eighty".