18918620 has 48 divisors (see below), whose sum is σ = 48081600. Its totient is φ = 6104064.

The previous prime is 18918619. The next prime is 18918709. The reversal of 18918620 is 2681981.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1595 + ... + 6354.

It is an arithmetic number, because the mean of its divisors is an integer number (1001700).

Almost surely, 2^18918620 is an apocalyptic number.

18918620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18918620 is an abundant number, since it is smaller than the sum of its proper divisors (29162980).

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

18918620 is a wasteful number, since it uses less digits than its factorization.

18918620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7982 (or 7980 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 18918620 is about 4349.5540001246. The cubic root of 18918620 is about 266.4586467990.

The spelling of 18918620 in words is "eighteen million, nine hundred eighteen thousand, six hundred twenty".