20987280

素因数分解:

$2^4\times 3^2\times 5^1\times {\mathrm{103}}^1\times {\mathrm{283}}^1$

素因数の和:405

約数の個数: 120

約数和(自身を含む): 71418048

約数和(自身を除く): 50430768

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 103, 120, 144, 180, 206, 240, 283, 309, 360, 412, 515, 566, 618, 720, 824, 849, 927, 1030, 1132, 1236, 1415, 1545, 1648, 1698, 1854, 2060, 2264, 2472, 2547, 2830, 3090, 3396, 3708, 4120, 4245, 4528, 4635, 4944, 5094, 5660, 6180, 6792, 7416, 8240, 8490, 9270, 10188, 11320, 12360, 12735, 13584, 14832, 16980, 18540, 20376, 22640, 24720, 25470, 29149, 33960, 37080, 40752, 50940, 58298, 67920, 74160, 87447, 101880, 116596, 145745, 174894, 203760, 233192, 262341, 291490, 349788, 437235, 466384, 524682, 582980, 699576, 874470, 1049364, 1165960, 1311705, 1399152, 1748940, 2098728, 2331920, 2623410, 3497880, 4197456, 5246820, 6995760, 10493640, 20987280]

約数ペア:

[(1, 20987280), (2, 10493640), (3, 6995760), (4, 5246820), (5, 4197456), (6, 3497880), (8, 2623410), (9, 2331920), (10, 2098728), (12, 1748940), (15, 1399152), (16, 1311705), (18, 1165960), (20, 1049364), (24, 874470), (30, 699576), (36, 582980), (40, 524682), (45, 466384), (48, 437235), (60, 349788), (72, 291490), (80, 262341), (90, 233192), (103, 203760), (120, 174894), (144, 145745), (180, 116596), (206, 101880), (240, 87447), (283, 74160), (309, 67920), (360, 58298), (412, 50940), (515, 40752), (566, 37080), (618, 33960), (720, 29149), (824, 25470), (849, 24720), (927, 22640), (1030, 20376), (1132, 18540), (1236, 16980), (1415, 14832), (1545, 13584), (1648, 12735), (1698, 12360), (1854, 11320), (2060, 10188), (2264, 9270), (2472, 8490), (2547, 8240), (2830, 7416), (3090, 6792), (3396, 6180), (3708, 5660), (4120, 5094), (4245, 4944), (4528, 4635)]