21391695

素因数分解:

$3^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{239}}^1$

素因数の和:286

約数の個数: 80

約数和(自身を含む): 43908480

約数和(自身を除く): 22516785

約数列:

[1, 3, 5, 9, 13, 15, 17, 27, 39, 45, 51, 65, 81, 85, 117, 135, 153, 195, 221, 239, 255, 351, 405, 459, 585, 663, 717, 765, 1053, 1105, 1195, 1377, 1755, 1989, 2151, 2295, 3107, 3315, 3585, 4063, 5265, 5967, 6453, 6885, 9321, 9945, 10755, 12189, 15535, 17901, 19359, 20315, 27963, 29835, 32265, 36567, 46605, 52819, 60945, 83889, 89505, 96795, 109701, 139815, 158457, 182835, 251667, 264095, 329103, 419445, 475371, 548505, 792285, 1258335, 1426113, 1645515, 2376855, 4278339, 7130565, 21391695]

約数ペア:

[(1, 21391695), (3, 7130565), (5, 4278339), (9, 2376855), (13, 1645515), (15, 1426113), (17, 1258335), (27, 792285), (39, 548505), (45, 475371), (51, 419445), (65, 329103), (81, 264095), (85, 251667), (117, 182835), (135, 158457), (153, 139815), (195, 109701), (221, 96795), (239, 89505), (255, 83889), (351, 60945), (405, 52819), (459, 46605), (585, 36567), (663, 32265), (717, 29835), (765, 27963), (1053, 20315), (1105, 19359), (1195, 17901), (1377, 15535), (1755, 12189), (1989, 10755), (2151, 9945), (2295, 9321), (3107, 6885), (3315, 6453), (3585, 5967), (4063, 5265)]