20021108 has 12 divisors (see below), whose sum is σ = 35076132. Its totient is φ = 9999360.

The previous prime is 20021093. The next prime is 20021137. The reversal of 20021108 is 80112002.

It can be written as a sum of positive squares in 2 ways, for example, as 7333264 + 12687844 = 2708^2 + 3562^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20021092 and 20021101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2228 + ... + 6708.

It is an arithmetic number, because the mean of its divisors is an integer number (2923011).

Almost surely, 2^20021108 is an apocalyptic number.

It is an amenable number.

20021108 is a deficient number, since it is larger than the sum of its proper divisors (15055024).

20021108 is a wasteful number, since it uses less digits than its factorization.

20021108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5602 (or 5600 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 20021108 is about 4474.4952787996. The cubic root of 20021108 is about 271.5372212964.

The spelling of 20021108 in words is "twenty million, twenty-one thousand, one hundred eight".