20021208 has 32 divisors (see below), whose sum is σ = 50804160. Its totient is φ = 6573600.

The previous prime is 20021203. The next prime is 20021213. The reversal of 20021208 is 80212002.

It is an interprime number because it is at equal distance from previous prime (20021203) and next prime (20021213).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021203) 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, 4618 + ... + 7833.

It is an arithmetic number, because the mean of its divisors is an integer number (1587630).

Almost surely, 2^20021208 is an apocalyptic number.

It is an amenable number.

20021208 is an abundant number, since it is smaller than the sum of its proper divisors (30782952).

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

20021208 is a wasteful number, since it uses less digits than its factorization.

20021208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12527 (or 12523 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 20021208 is about 4474.5064532303. The cubic root of 20021208 is about 271.5376733806.

The spelling of 20021208 in words is "twenty million, twenty-one thousand, two hundred eight".