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20432081 is a prime number
BaseRepresentation
bin100110111110…
…0010011010001
31102110001112202
41031330103101
520212311311
62005532545
7335445515
oct115742321
942401482
1020432081
1110595a1a
126a14155
134304cb7
1429dc145
151bd8e3b
hex137c4d1

20432081 has 2 divisors, whose sum is σ = 20432082. Its totient is φ = 20432080.

The previous prime is 20432077. The next prime is 20432099. The reversal of 20432081 is 18023402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 1681 = 4520^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 20432081 - 22 = 20432077 is a prime.

It is a super-2 number, since 2×204320812 = 834939867981122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20432021) 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 as a sum of consecutive naturals, namely, 10216040 + 10216041.

It is an arithmetic number, because the mean of its divisors is an integer number (10216041).

Almost surely, 220432081 is an apocalyptic number.

It is an amenable number.

20432081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20432081 is an equidigital number, since it uses as much as digits as its factorization.

20432081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20432081 is about 4520.1859475026. The cubic root of 20432081 is about 273.3825985296.

Adding to 20432081 its reverse (18023402), we get a palindrome (38455483).

The spelling of 20432081 in words is "twenty million, four hundred thirty-two thousand, eighty-one".