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20122101 = 35174871
BaseRepresentation
bin100110011000…
…0100111110101
31101212022100000
41030300213311
520122401401
61555141513
7333015006
oct114604765
941768300
1020122101
11103a403a
1268a4899
134226b8c
14295b1ad
151b77186
hex13309f5

20122101 has 24 divisors (see below), whose sum is σ = 31921344. Its totient is φ = 12623040.

The previous prime is 20122093. The next prime is 20122133. The reversal of 20122101 is 10122102.

It is not a de Polignac number, because 20122101 - 23 = 20122093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122601) 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 23 ways as a sum of consecutive naturals, for example, 1696 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (1330056).

Almost surely, 220122101 is an apocalyptic number.

It is an amenable number.

20122101 is a deficient number, since it is larger than the sum of its proper divisors (11799243).

20122101 is an equidigital number, since it uses as much as digits as its factorization.

20122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4903 (or 4891 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 20122101 is about 4485.7664896871. The cubic root of 20122101 is about 271.9930298459.

Adding to 20122101 its reverse (10122102), we get a palindrome (30244203).

Subtracting from 20122101 its reverse (10122102), we obtain a palindrome (9999999).

The spelling of 20122101 in words is "twenty million, one hundred twenty-two thousand, one hundred one".

Divisors: 1 3 9 17 27 51 81 153 243 459 1377 4131 4871 14613 43839 82807 131517 248421 394551 745263 1183653 2235789 6707367 20122101