21187899

素因数分解:

$3^5\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{223}}^1$

素因数の和:278

約数の個数: 48

約数和(自身を含む): 35223552

約数和(自身を除く): 14035653

約数列:

[1, 3, 9, 17, 23, 27, 51, 69, 81, 153, 207, 223, 243, 391, 459, 621, 669, 1173, 1377, 1863, 2007, 3519, 3791, 4131, 5129, 5589, 6021, 10557, 11373, 15387, 18063, 31671, 34119, 46161, 54189, 87193, 95013, 102357, 138483, 261579, 307071, 415449, 784737, 921213, 1246347, 2354211, 7062633, 21187899]

約数ペア:

[(1, 21187899), (3, 7062633), (9, 2354211), (17, 1246347), (23, 921213), (27, 784737), (51, 415449), (69, 307071), (81, 261579), (153, 138483), (207, 102357), (223, 95013), (243, 87193), (391, 54189), (459, 46161), (621, 34119), (669, 31671), (1173, 18063), (1377, 15387), (1863, 11373), (2007, 10557), (3519, 6021), (3791, 5589), (4131, 5129)]