21005475

素因数分解:

$3^1\times 5^2\times {\mathrm{47}}^1\times {\mathrm{59}}^1\times {\mathrm{101}}^1$

素因数の和:220

約数の個数: 48

約数和(自身を含む): 36426240

約数和(自身を除く): 15420765

約数列:

[1, 3, 5, 15, 25, 47, 59, 75, 101, 141, 177, 235, 295, 303, 505, 705, 885, 1175, 1475, 1515, 2525, 2773, 3525, 4425, 4747, 5959, 7575, 8319, 13865, 14241, 17877, 23735, 29795, 41595, 69325, 71205, 89385, 118675, 148975, 207975, 280073, 356025, 446925, 840219, 1400365, 4201095, 7001825, 21005475]

約数ペア:

[(1, 21005475), (3, 7001825), (5, 4201095), (15, 1400365), (25, 840219), (47, 446925), (59, 356025), (75, 280073), (101, 207975), (141, 148975), (177, 118675), (235, 89385), (295, 71205), (303, 69325), (505, 41595), (705, 29795), (885, 23735), (1175, 17877), (1475, 14241), (1515, 13865), (2525, 8319), (2773, 7575), (3525, 5959), (4425, 4747)]