20102280 has 128 divisors (see below), whose sum is σ = 66890880. Its totient is φ = 4792320.

The previous prime is 20102273. The next prime is 20102293. The reversal of 20102280 is 8220102.

It is a super-2 number, since 2×20102280² = 808203322396800, which contains 22 as substring.

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

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 31 ways as a sum of consecutive naturals, for example, 127962 + ... + 128118.

It is an arithmetic number, because the mean of its divisors is an integer number (522585).

Almost surely, 2^20102280 is an apocalyptic number.

20102280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20102280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33445440).

20102280 is an abundant number, since it is smaller than the sum of its proper divisors (46788600).

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

20102280 is a wasteful number, since it uses less digits than its factorization.

20102280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 275 counting only the distinct ones).

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

The square root of 20102280 is about 4483.5566239315. The cubic root of 20102280 is about 271.9036928365.

Adding to 20102280 its reverse (8220102), we get a palindrome (28322382).

It can be divided in two parts, 201022 and 80, that added together give a palindrome (201102).

The spelling of 20102280 in words is "twenty million, one hundred two thousand, two hundred eighty".