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2221020 = 22355457
BaseRepresentation
bin1000011110001111011100
311011211200000
420132033130
51032033040
6115334300
724610164
oct10361734
94154600
102221020
11128775a
128b1390
135c9c19
1441b5a4
152dd130
hex21e3dc

2221020 has 72 divisors (see below), whose sum is σ = 7001904. Its totient is φ = 590976.

The previous prime is 2221019. The next prime is 2221031. The reversal of 2221020 is 201222.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2220993 and 2221011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4632 + ... + 5088.

22221020 is an apocalyptic number.

2221020 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 2221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3500952).

2221020 is an abundant number, since it is smaller than the sum of its proper divisors (4780884).

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

2221020 is a wasteful number, since it uses less digits than its factorization.

2221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2221020 is about 1490.3086928553. The cubic root of 2221020 is about 130.4720510896.

Adding to 2221020 its reverse (201222), we get a palindrome (2422242).

The spelling of 2221020 in words is "two million, two hundred twenty-one thousand, twenty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 45 54 60 81 90 108 135 162 180 243 270 324 405 457 486 540 810 914 972 1215 1371 1620 1828 2285 2430 2742 4113 4570 4860 5484 6855 8226 9140 12339 13710 16452 20565 24678 27420 37017 41130 49356 61695 74034 82260 111051 123390 148068 185085 222102 246780 370170 444204 555255 740340 1110510 2221020