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20885519 = 73286103
BaseRepresentation
bin100111110101…
…1000000001111
31110022002112202
41033223000033
520321314034
62023352115
7342344504
oct117530017
943262482
1020885519
1110875666
126bb263b
1344334c5
142ab94ab
151c7847e
hex13eb00f

20885519 has 4 divisors (see below), whose sum is σ = 21171696. Its totient is φ = 20599344.

The previous prime is 20885509. The next prime is 20885533. The reversal of 20885519 is 91558802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20885519 is a prime.

It is a super-2 number, since 2×208855192 = 872409807798722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20885509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142979 + ... + 143124.

It is an arithmetic number, because the mean of its divisors is an integer number (5292924).

Almost surely, 220885519 is an apocalyptic number.

20885519 is a deficient number, since it is larger than the sum of its proper divisors (286177).

20885519 is an equidigital number, since it uses as much as digits as its factorization.

20885519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286176.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 20885519 is about 4570.0677237870. The cubic root of 20885519 is about 275.3901635387.

The spelling of 20885519 in words is "twenty million, eight hundred eighty-five thousand, five hundred nineteen".

Divisors: 1 73 286103 20885519