18780120 has 64 divisors (see below), whose sum is σ = 62604000. Its totient is φ = 5007744.

The previous prime is 18780103. The next prime is 18780137. The reversal of 18780120 is 2108781.

It is an interprime number because it is at equal distance from previous prime (18780103) and next prime (18780137).

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 7615 + ... + 9774.

Almost surely, 2^18780120 is an apocalyptic number.

18780120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18780120 is an abundant number, since it is smaller than the sum of its proper divisors (43823880).

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

18780120 is a wasteful number, since it uses less digits than its factorization.

18780120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17409 (or 17399 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 18780120 is about 4333.6035813166. The cubic root of 18780120 is about 265.8068207514.

The spelling of 18780120 in words is "eighteen million, seven hundred eighty thousand, one hundred twenty".