20028210 has 64 divisors (see below), whose sum is σ = 51414912. Its totient is φ = 4975616.

The previous prime is 20028209. The next prime is 20028221. The reversal of 20028210 is 1282002.

It is a super-2 number, since 2×20028210² = 802258391608200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20028210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88117 + ... + 88343.

It is an arithmetic number, because the mean of its divisors is an integer number (803358).

Almost surely, 2^20028210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20028210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25707456).

20028210 is an abundant number, since it is smaller than the sum of its proper divisors (31386702).

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

20028210 is a wasteful number, since it uses less digits than its factorization.

20028210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

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

The square root of 20028210 is about 4475.2888174955. The cubic root of 20028210 is about 271.5693245707.

The spelling of 20028210 in words is "twenty million, twenty-eight thousand, two hundred ten".