18958820 has 24 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 7563872.

The previous prime is 18958817. The next prime is 18958867. The reversal of 18958820 is 2885981.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8591 + ... + 10569.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^18958820 is an apocalyptic number.

18958820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18958820 is an abundant number, since it is smaller than the sum of its proper divisors (20957980).

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

18958820 is a wasteful number, since it uses less digits than its factorization.

18958820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2467 (or 2465 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 18958820 is about 4354.1727113196. The cubic root of 18958820 is about 266.6472451133.

The spelling of 18958820 in words is "eighteen million, nine hundred fifty-eight thousand, eight hundred twenty".