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20121375 = 35353657
BaseRepresentation
bin100110011000…
…0011100011111
31101212021100010
41030300130133
520122341000
61555134303
7333012621
oct114603437
941767303
1020121375
11103a353a
1268a4393
134226751
14295ac11
151b76d50
hex133071f

20121375 has 16 divisors (see below), whose sum is σ = 33482592. Its totient is φ = 10731200.

The previous prime is 20121349. The next prime is 20121391. The reversal of 20121375 is 57312102.

It is not a de Polignac number, because 20121375 - 217 = 19990303 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 26454 + ... + 27203.

It is an arithmetic number, because the mean of its divisors is an integer number (2092662).

Almost surely, 220121375 is an apocalyptic number.

20121375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20121375 is a deficient number, since it is larger than the sum of its proper divisors (13361217).

20121375 is an equidigital number, since it uses as much as digits as its factorization.

20121375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53675 (or 53665 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20121375 is about 4485.6855663321. The cubic root of 20121375 is about 271.9897586614.

Adding to 20121375 its reverse (57312102), we get a palindrome (77433477).

The spelling of 20121375 in words is "twenty million, one hundred twenty-one thousand, three hundred seventy-five".

Divisors: 1 3 5 15 25 75 125 375 53657 160971 268285 804855 1341425 4024275 6707125 20121375