20031818 has 8 divisors (see below), whose sum is σ = 30110400. Its totient is φ = 9995020.

The previous prime is 20031799. The next prime is 20031829. The reversal of 20031818 is 81813002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20031793 and 20031802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9218 + ... + 11181.

It is an arithmetic number, because the mean of its divisors is an integer number (3763800).

Almost surely, 2^20031818 is an apocalyptic number.

20031818 is a deficient number, since it is larger than the sum of its proper divisors (10078582).

20031818 is a wasteful number, since it uses less digits than its factorization.

20031818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20892.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 20031818 is about 4475.6919018181. The cubic root of 20031818 is about 271.5856309588.

The spelling of 20031818 in words is "twenty million, thirty-one thousand, eight hundred eighteen".