18426420 has 48 divisors (see below), whose sum is σ = 57328320. Its totient is φ = 4913568.

The previous prime is 18426389. The next prime is 18426433. The reversal of 18426420 is 2462481.

18426420 is a `hidden beast` number, since 18 + 4 + 2 + 642 + 0 = 666.

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, 16522 + ... + 17601.

It is an arithmetic number, because the mean of its divisors is an integer number (1194340).

Almost surely, 2^18426420 is an apocalyptic number.

18426420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18426420 is an abundant number, since it is smaller than the sum of its proper divisors (38901900).

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

18426420 is a wasteful number, since it uses less digits than its factorization.

18426420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34141 (or 34133 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 18426420 is about 4292.6006103527. The cubic root of 18426420 is about 264.1275210377.

The spelling of 18426420 in words is "eighteen million, four hundred twenty-six thousand, four hundred twenty".