21550275

素因数分解:

$3^2\times 5^2\times {\mathrm{19}}^1\times {\mathrm{71}}^2$

素因数の和:177

約数の個数: 54

約数和(自身を含む): 41210780

約数和(自身を除く): 19660505

約数列:

[1, 3, 5, 9, 15, 19, 25, 45, 57, 71, 75, 95, 171, 213, 225, 285, 355, 475, 639, 855, 1065, 1349, 1425, 1775, 3195, 4047, 4275, 5041, 5325, 6745, 12141, 15123, 15975, 20235, 25205, 33725, 45369, 60705, 75615, 95779, 101175, 126025, 226845, 287337, 303525, 378075, 478895, 862011, 1134225, 1436685, 2394475, 4310055, 7183425, 21550275]

約数ペア:

[(1, 21550275), (3, 7183425), (5, 4310055), (9, 2394475), (15, 1436685), (19, 1134225), (25, 862011), (45, 478895), (57, 378075), (71, 303525), (75, 287337), (95, 226845), (171, 126025), (213, 101175), (225, 95779), (285, 75615), (355, 60705), (475, 45369), (639, 33725), (855, 25205), (1065, 20235), (1349, 15975), (1425, 15123), (1775, 12141), (3195, 6745), (4047, 5325), (4275, 5041)]