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20831428 = 2243911863
BaseRepresentation
bin100111101110…
…1110011000100
31110012100100101
41033131303010
520313101203
62022253444
7342031012
oct117356304
943170311
1020831428
1110838a62
126b87284
1344149b7
142aa38b2
151c6741d
hex13ddcc4

20831428 has 12 divisors (see below), whose sum is σ = 36541120. Its totient is φ = 10391112.

The previous prime is 20831323. The next prime is 20831533. The reversal of 20831428 is 82413802.

It is an interprime number because it is at equal distance from previous prime (20831323) and next prime (20831533).

It is a lonely number, since its distance to closest prime (20831533) sets a new record.

It is a junction number, because it is equal to n+sod(n) for n = 20831396 and 20831405.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4176 + ... + 7687.

Almost surely, 220831428 is an apocalyptic number.

It is an amenable number.

20831428 is a deficient number, since it is larger than the sum of its proper divisors (15709692).

20831428 is a wasteful number, since it uses less digits than its factorization.

20831428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12306 (or 12304 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20831428 is about 4564.1459222948. The cubic root of 20831428 is about 275.1522154561.

The spelling of 20831428 in words is "twenty million, eight hundred thirty-one thousand, four hundred twenty-eight".

Divisors: 1 2 4 439 878 1756 11863 23726 47452 5207857 10415714 20831428