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20112001 = 721331573
BaseRepresentation
bin100110010111…
…0001010000001
31101211210110221
41030232022001
520122041001
61555023041
7332643400
oct114561201
941753427
1020112001
1110397498
12689aa81
1342223c0
142957637
151b741a1
hex132e281

20112001 has 12 divisors (see below), whose sum is σ = 25196052. Its totient is φ = 15912288.

The previous prime is 20111999. The next prime is 20112007. The reversal of 20112001 is 10021102.

Adding to 20112001 its reverse (10021102), we get a palindrome (30133103).

It can be written as a sum of positive squares in 2 ways, for example, as 5664400 + 14447601 = 2380^2 + 3801^2 .

It is not a de Polignac number, because 20112001 - 21 = 20111999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15150 + ... + 16423.

It is an arithmetic number, because the mean of its divisors is an integer number (2099671).

Almost surely, 220112001 is an apocalyptic number.

It is an amenable number.

20112001 is a deficient number, since it is larger than the sum of its proper divisors (5084051).

20112001 is a wasteful number, since it uses less digits than its factorization.

20112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31600 (or 31593 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 20112001 is about 4484.6405653073. The cubic root of 20112001 is about 271.9475145630.

The spelling of 20112001 in words is "twenty million, one hundred twelve thousand, one".

Divisors: 1 7 13 49 91 637 31573 221011 410449 1547077 2873143 20112001