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20020121 = 112997647
BaseRepresentation
bin100110001011…
…1101110011001
31101200010102222
41030113232121
520111120441
61553033425
7332111462
oct114275631
941603388
1020020121
1110334460
126855875
1341bc634
142931d69
151b56d4b
hex1317b99

20020121 has 16 divisors (see below), whose sum is σ = 22861440. Its totient is φ = 17364480.

The previous prime is 20020109. The next prime is 20020151. The reversal of 20020121 is 12102002.

It is a cyclic number.

It is not a de Polignac number, because 20020121 - 218 = 19757977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020099 and 20020108.

It is not an unprimeable number, because it can be changed into a prime (20020151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30620 + ... + 31266.

It is an arithmetic number, because the mean of its divisors is an integer number (1428840).

Almost surely, 220020121 is an apocalyptic number.

It is an amenable number.

20020121 is a deficient number, since it is larger than the sum of its proper divisors (2841319).

20020121 is a wasteful number, since it uses less digits than its factorization.

20020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784.

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

The square root of 20020121 is about 4474.3849856712. The cubic root of 20020121 is about 271.5327591451.

Adding to 20020121 its reverse (12102002), we get a palindrome (32122123).

The spelling of 20020121 in words is "twenty million, twenty thousand, one hundred twenty-one".

Divisors: 1 11 29 97 319 647 1067 2813 7117 18763 30943 62759 206393 690349 1820011 20020121