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19713881 = 112922131
BaseRepresentation
bin100101100110…
…0111101011001
31101002120100202
41023030331121
520021321011
61542311545
7326364605
oct113147531
941076322
1019713881
1110145370
1267285b5
134113125
142892505
151ae623b
hex12ccf59

19713881 has 12 divisors (see below), whose sum is σ = 22283664. Its totient is φ = 17295600.

The previous prime is 19713877. The next prime is 19713899. The reversal of 19713881 is 18831791.

It is not a de Polignac number, because 19713881 - 22 = 19713877 is a prime.

It is a super-2 number, since 2×197138812 = 777274208164322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19713851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8186 + ... + 10316.

It is an arithmetic number, because the mean of its divisors is an integer number (1856972).

Almost surely, 219713881 is an apocalyptic number.

19713881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19713881 is a deficient number, since it is larger than the sum of its proper divisors (2569783).

19713881 is a wasteful number, since it uses less digits than its factorization.

19713881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200 (or 2171 counting only the distinct ones).

The product of its digits is 12096, while the sum is 38.

The square root of 19713881 is about 4440.0316440314. The cubic root of 19713881 is about 270.1411287798.

The spelling of 19713881 in words is "nineteen million, seven hundred thirteen thousand, eight hundred eighty-one".

Divisors: 1 11 29 319 841 2131 9251 23441 61799 679789 1792171 19713881