20021118 has 32 divisors (see below), whose sum is σ = 43322496. Its totient is φ = 6131808.

The previous prime is 20021093. The next prime is 20021137. The reversal of 20021118 is 81112002.

It is a junction number, because it is equal to n+sod(n) for n = 20021097 and 20021106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21621 + ... + 22527.

It is an arithmetic number, because the mean of its divisors is an integer number (1353828).

Almost surely, 2^20021118 is an apocalyptic number.

20021118 is an abundant number, since it is smaller than the sum of its proper divisors (23301378).

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

20021118 is a wasteful number, since it uses less digits than its factorization.

20021118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 20021118 is about 4474.4963962439. The cubic root of 20021118 is about 271.5372665049.

The spelling of 20021118 in words is "twenty million, twenty-one thousand, one hundred eighteen".