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20423304331 = 171201370843
BaseRepresentation
bin10011000001010100…
…101110010010001011
31221201100001100121221
4103001110232102023
5313311331214311
613214330142511
71322052136213
oct230124562213
957640040557
1020423304331
118730471911
123b5b881a37
131c062b8681
14dba5d5243
157e7ed4671
hex4c152e48b

20423304331 has 4 divisors (see below), whose sum is σ = 21624675192. Its totient is φ = 19221933472.

The previous prime is 20423304329. The next prime is 20423304347. The reversal of 20423304331 is 13340332402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20423304331 - 21 = 20423304329 is a prime.

It is a super-2 number, since 2×204233043312 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20423304296 and 20423304305.

It is not an unprimeable number, because it can be changed into a prime (20423364331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600685405 + ... + 600685438.

It is an arithmetic number, because the mean of its divisors is an integer number (5406168798).

Almost surely, 220423304331 is an apocalyptic number.

20423304331 is a deficient number, since it is larger than the sum of its proper divisors (1201370861).

20423304331 is a wasteful number, since it uses less digits than its factorization.

20423304331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201370860.

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 20423304331 its reverse (13340332402), we get a palindrome (33763636733).

The spelling of 20423304331 in words is "twenty billion, four hundred twenty-three million, three hundred four thousand, three hundred thirty-one".

Divisors: 1 17 1201370843 20423304331