21408525

素因数分解:

$3^2\times 5^2\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{193}}^1$

素因数の和:255

約数の個数: 72

約数和(自身を含む): 42218280

約数和(自身を除く): 20809755

約数列:

[1, 3, 5, 9, 15, 17, 25, 29, 45, 51, 75, 85, 87, 145, 153, 193, 225, 255, 261, 425, 435, 493, 579, 725, 765, 965, 1275, 1305, 1479, 1737, 2175, 2465, 2895, 3281, 3825, 4437, 4825, 5597, 6525, 7395, 8685, 9843, 12325, 14475, 16405, 16791, 22185, 27985, 29529, 36975, 43425, 49215, 50373, 82025, 83955, 95149, 110925, 139925, 147645, 246075, 251865, 285447, 419775, 475745, 738225, 856341, 1259325, 1427235, 2378725, 4281705, 7136175, 21408525]

約数ペア:

[(1, 21408525), (3, 7136175), (5, 4281705), (9, 2378725), (15, 1427235), (17, 1259325), (25, 856341), (29, 738225), (45, 475745), (51, 419775), (75, 285447), (85, 251865), (87, 246075), (145, 147645), (153, 139925), (193, 110925), (225, 95149), (255, 83955), (261, 82025), (425, 50373), (435, 49215), (493, 43425), (579, 36975), (725, 29529), (765, 27985), (965, 22185), (1275, 16791), (1305, 16405), (1479, 14475), (1737, 12325), (2175, 9843), (2465, 8685), (2895, 7395), (3281, 6525), (3825, 5597), (4437, 4825)]