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20010221 = 7113183101
BaseRepresentation
bin100110001010…
…1010011101101
31101122121212022
41030111103231
520110311341
61552515525
7332040560
oct114252355
941577768
1020010221
1110327a80
12684bba5
1341b7c8a
14292c4d7
151b53e4b
hex13154ed

20010221 has 32 divisors (see below), whose sum is σ = 26320896. Its totient is φ = 14760000.

The previous prime is 20010217. The next prime is 20010223. The reversal of 20010221 is 12201002.

It is a cyclic number.

It is not a de Polignac number, because 20010221 - 22 = 20010217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20010199 and 20010208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010223) 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 31 ways as a sum of consecutive naturals, for example, 198071 + ... + 198171.

It is an arithmetic number, because the mean of its divisors is an integer number (822528).

Almost surely, 220010221 is an apocalyptic number.

It is an amenable number.

20010221 is a deficient number, since it is larger than the sum of its proper divisors (6310675).

20010221 is a wasteful number, since it uses less digits than its factorization.

20010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 20010221 is about 4473.2785515771. The cubic root of 20010221 is about 271.4879938888.

Adding to 20010221 its reverse (12201002), we get a palindrome (32211223).

The spelling of 20010221 in words is "twenty million, ten thousand, two hundred twenty-one".

Divisors: 1 7 11 31 77 83 101 217 341 581 707 913 1111 2387 2573 3131 6391 7777 8383 18011 21917 28303 34441 58681 92213 198121 241087 259873 645491 1819111 2858603 20010221