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20831425 = 522959487
BaseRepresentation
bin100111101110…
…1110011000001
31110012100100021
41033131303001
520313101200
62022253441
7342031006
oct117356301
943170307
1020831425
1110838a5a
126b87281
1344149b4
142aa38ad
151c6741a
hex13ddcc1

20831425 has 24 divisors (see below), whose sum is σ = 27230400. Its totient is φ = 15785280.

The previous prime is 20831323. The next prime is 20831533. The reversal of 20831425 is 52413802.

It is not a de Polignac number, because 20831425 - 223 = 12442817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a lonely number, since its distance to closest prime (20831323) sets a new record.

It is a self number, because there is not a number n which added to its sum of digits gives 20831425.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42532 + ... + 43018.

It is an arithmetic number, because the mean of its divisors is an integer number (1134600).

Almost surely, 220831425 is an apocalyptic number.

20831425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20831425 is a deficient number, since it is larger than the sum of its proper divisors (6398975).

20831425 is a wasteful number, since it uses less digits than its factorization.

20831425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20831425 is about 4564.1455936462. The cubic root of 20831425 is about 275.1522022476.

The spelling of 20831425 in words is "twenty million, eight hundred thirty-one thousand, four hundred twenty-five".

Divisors: 1 5 25 29 59 145 295 487 725 1475 1711 2435 8555 12175 14123 28733 42775 70615 143665 353075 718325 833257 4166285 20831425