18669420 has 192 divisors, whose sum is σ = 72576000. Its totient is φ = 3870720.

The previous prime is 18669403. The next prime is 18669433. The reversal of 18669420 is 2496681.

It is a hoax number, since the sum of its digits (36) 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 (36).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41356 + ... + 41804.

It is an arithmetic number, because the mean of its divisors is an integer number (378000).

Almost surely, 2^18669420 is an apocalyptic number.

18669420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18669420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36288000).

18669420 is an abundant number, since it is smaller than the sum of its proper divisors (53906580).

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

18669420 is a wasteful number, since it uses less digits than its factorization.

18669420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 18669420 is about 4320.8124236074. The cubic root of 18669420 is about 265.2835223505.

The spelling of 18669420 in words is "eighteen million, six hundred sixty-nine thousand, four hundred twenty".