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20120201 = 109197937
BaseRepresentation
bin100110011000…
…0001010001001
31101212012201122
41030300022021
520122321301
61555125025
7333006323
oct114601211
941765648
1020120201
11103a2672
1268a3775
13422605a
14295a613
151b7681b
hex1330289

20120201 has 8 divisors (see below), whose sum is σ = 20429640. Its totient is φ = 19813248.

The previous prime is 20120189. The next prime is 20120203. The reversal of 20120201 is 10202102.

It can be written as a sum of positive squares in 4 ways, for example, as 5290000 + 14830201 = 2300^2 + 3851^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20120201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20120203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21005 + ... + 21941.

It is an arithmetic number, because the mean of its divisors is an integer number (2553705).

Almost surely, 220120201 is an apocalyptic number.

It is an amenable number.

20120201 is a deficient number, since it is larger than the sum of its proper divisors (309439).

20120201 is a wasteful number, since it uses less digits than its factorization.

20120201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243.

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

The square root of 20120201 is about 4485.5547037128. The cubic root of 20120201 is about 271.9844687282.

Adding to 20120201 its reverse (10202102), we get a palindrome (30322303).

It can be divided in two parts, 201 and 20201, that added together give a palindrome (20402).

The spelling of 20120201 in words is "twenty million, one hundred twenty thousand, two hundred one".

Divisors: 1 109 197 937 21473 102133 184589 20120201