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20831423 = 83419599
BaseRepresentation
bin100111101110…
…1110010111111
31110012100100012
41033131302333
520313101143
62022253435
7342031004
oct117356277
943170305
1020831423
1110838a58
126b8727b
1344149b2
142aa38ab
151c67418
hex13ddcbf

20831423 has 8 divisors (see below), whose sum is σ = 21168000. Its totient is φ = 20497048.

The previous prime is 20831323. The next prime is 20831533. The reversal of 20831423 is 32413802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20831423 - 210 = 20830399 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20831323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34478 + ... + 35076.

It is an arithmetic number, because the mean of its divisors is an integer number (2646000).

Almost surely, 220831423 is an apocalyptic number.

20831423 is a deficient number, since it is larger than the sum of its proper divisors (336577).

20831423 is an equidigital number, since it uses as much as digits as its factorization.

20831423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20831423 is about 4564.1453745471. The cubic root of 20831423 is about 275.1521934419.

It can be divided in two parts, 2083142 and 3, that multiplied together give a palindrome (6249426).

The spelling of 20831423 in words is "twenty million, eight hundred thirty-one thousand, four hundred twenty-three".

Divisors: 1 83 419 599 34777 49717 250981 20831423