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20123203131 = 3288711092273
BaseRepresentation
bin10010101111011011…
…111011011000111011
31220221102100122011200
4102233123323120323
5312203020000011
613124450025243
71311446255463
oct225733733073
956842318150
1020123203131
118597029399
123a97278223
131b890837b5
14d8c7d6ba3
157cb9a5856
hex4af6fb63b

20123203131 has 24 divisors (see below), whose sum is σ = 29138672160. Its totient is φ = 13382370816.

The previous prime is 20123203123. The next prime is 20123203157. The reversal of 20123203131 is 13130232102.

20123203131 is a `hidden beast` number, since 20 + 12 + 320 + 313 + 1 = 666.

It is not a de Polignac number, because 20123203131 - 23 = 20123203123 is a prime.

It is a super-2 number, since 2×201232031312 (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20123203181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8852011 + ... + 8854283.

It is an arithmetic number, because the mean of its divisors is an integer number (1214111340).

Almost surely, 220123203131 is an apocalyptic number.

20123203131 is a deficient number, since it is larger than the sum of its proper divisors (9015469029).

20123203131 is a wasteful number, since it uses less digits than its factorization.

20123203131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4275 (or 4272 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20123203131 its reverse (13130232102), we get a palindrome (33253435233).

The spelling of 20123203131 in words is "twenty billion, one hundred twenty-three million, two hundred three thousand, one hundred thirty-one".

Divisors: 1 3 9 887 1109 2273 2661 3327 6819 7983 9981 20457 983683 2016151 2520757 2951049 6048453 7562271 8853147 18145359 22686813 2235911459 6707734377 20123203131