21051525

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1$

素因数の和:139

約数の個数: 96

約数和(自身を含む): 42854400

約数和(自身を除く): 21802875

約数列:

[1, 3, 5, 11, 15, 17, 19, 25, 33, 51, 55, 57, 75, 79, 85, 95, 165, 187, 209, 237, 255, 275, 285, 323, 395, 425, 475, 561, 627, 825, 869, 935, 969, 1045, 1185, 1275, 1343, 1425, 1501, 1615, 1975, 2607, 2805, 3135, 3553, 4029, 4345, 4503, 4675, 4845, 5225, 5925, 6715, 7505, 8075, 10659, 13035, 14025, 14773, 15675, 16511, 17765, 20145, 21725, 22515, 24225, 25517, 33575, 37525, 44319, 49533, 53295, 65175, 73865, 76551, 82555, 88825, 100725, 112575, 127585, 221595, 247665, 266475, 280687, 369325, 382755, 412775, 637925, 842061, 1107975, 1238325, 1403435, 1913775, 4210305, 7017175, 21051525]

約数ペア:

[(1, 21051525), (3, 7017175), (5, 4210305), (11, 1913775), (15, 1403435), (17, 1238325), (19, 1107975), (25, 842061), (33, 637925), (51, 412775), (55, 382755), (57, 369325), (75, 280687), (79, 266475), (85, 247665), (95, 221595), (165, 127585), (187, 112575), (209, 100725), (237, 88825), (255, 82555), (275, 76551), (285, 73865), (323, 65175), (395, 53295), (425, 49533), (475, 44319), (561, 37525), (627, 33575), (825, 25517), (869, 24225), (935, 22515), (969, 21725), (1045, 20145), (1185, 17765), (1275, 16511), (1343, 15675), (1425, 14773), (1501, 14025), (1615, 13035), (1975, 10659), (2607, 8075), (2805, 7505), (3135, 6715), (3553, 5925), (4029, 5225), (4345, 4845), (4503, 4675)]