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20019371 = 29176863
BaseRepresentation
bin100110001011…
…1100010101011
31101200002102012
41030113202223
520111104441
61553030135
7332106341
oct114274253
941602365
1020019371
1110333939
12685534b
1341bc1a8
142931991
151b569eb
hex13178ab

20019371 has 4 divisors (see below), whose sum is σ = 20029152. Its totient is φ = 20009592.

The previous prime is 20019347. The next prime is 20019403. The reversal of 20019371 is 17391002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17391002 = 28695501.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20019371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20019341) 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, 515 + ... + 6348.

It is an arithmetic number, because the mean of its divisors is an integer number (5007288).

Almost surely, 220019371 is an apocalyptic number.

20019371 is a deficient number, since it is larger than the sum of its proper divisors (9781).

20019371 is an equidigital number, since it uses as much as digits as its factorization.

20019371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9780.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 20019371 is about 4474.3011744852. The cubic root of 20019371 is about 271.5293683545.

The spelling of 20019371 in words is "twenty million, nineteen thousand, three hundred seventy-one".

Divisors: 1 2917 6863 20019371