18924420 has 24 divisors (see below), whose sum is σ = 52988544. Its totient is φ = 5046496.

The previous prime is 18924407. The next prime is 18924421. The reversal of 18924420 is 2442981.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (18924421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157644 + ... + 157763.

It is an arithmetic number, because the mean of its divisors is an integer number (2207856).

Almost surely, 2^18924420 is an apocalyptic number.

18924420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18924420 is an abundant number, since it is smaller than the sum of its proper divisors (34064124).

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

18924420 is a wasteful number, since it uses less digits than its factorization.

18924420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315419 (or 315417 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18924420 is about 4350.2206840573. The cubic root of 18924420 is about 266.4858739830.

The spelling of 18924420 in words is "eighteen million, nine hundred twenty-four thousand, four hundred twenty".