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20433221 = 37015521
BaseRepresentation
bin100110111110…
…0100101000101
31102110010002222
41031330211011
520212330341
62005542125
7335452034
oct115744505
942403088
1020433221
1110596866
126a14945
134305683
1429dc71b
151bd944b
hex137c945

20433221 has 4 divisors (see below), whose sum is σ = 20442444. Its totient is φ = 20424000.

The previous prime is 20433181. The next prime is 20433229. The reversal of 20433221 is 12233402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6964321 + 13468900 = 2639^2 + 3670^2 .

It is a cyclic number.

It is not a de Polignac number, because 20433221 - 222 = 16238917 is a prime.

It is a Duffinian number.

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 20433221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20433229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (5110611).

Almost surely, 220433221 is an apocalyptic number.

It is an amenable number.

20433221 is a deficient number, since it is larger than the sum of its proper divisors (9223).

20433221 is an equidigital number, since it uses as much as digits as its factorization.

20433221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9222.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20433221 is about 4520.3120467508. The cubic root of 20433221 is about 273.3876828602.

Adding to 20433221 its reverse (12233402), we get a palindrome (32666623).

The spelling of 20433221 in words is "twenty million, four hundred thirty-three thousand, two hundred twenty-one".

Divisors: 1 3701 5521 20433221