18820038 has 16 divisors (see below), whose sum is σ = 38854656. Its totient is φ = 6070920.

The previous prime is 18820031. The next prime is 18820063. The reversal of 18820038 is 83002881.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18819987 and 18820014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820031) 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, 50406 + ... + 50777.

It is an arithmetic number, because the mean of its divisors is an integer number (2428416).

Almost surely, 2^18820038 is an apocalyptic number.

18820038 is an abundant number, since it is smaller than the sum of its proper divisors (20034618).

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

18820038 is a wasteful number, since it uses less digits than its factorization.

18820038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101219.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18820038 is about 4338.2067723888. The cubic root of 18820038 is about 265.9950156414.

The spelling of 18820038 in words is "eighteen million, eight hundred twenty thousand, thirty-eight".