18406620 has 36 divisors (see below), whose sum is σ = 55833960. Its totient is φ = 4908384.

The previous prime is 18406607. The next prime is 18406621. The reversal of 18406620 is 2660481.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18406621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50950 + ... + 51309.

Almost surely, 2^18406620 is an apocalyptic number.

18406620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18406620 is an abundant number, since it is smaller than the sum of its proper divisors (37427340).

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

18406620 is a wasteful number, since it uses less digits than its factorization.

18406620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102274 (or 102269 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 18406620 is about 4290.2936962404. The cubic root of 18406620 is about 264.0328815793.

The spelling of 18406620 in words is "eighteen million, four hundred six thousand, six hundred twenty".