21518325

素因数分解:

$3^3\times 5^2\times {\mathrm{71}}^1\times {\mathrm{449}}^1$

素因数の和:539

約数の個数: 48

約数和(自身を含む): 40176000

約数和(自身を除く): 18657675

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 71, 75, 135, 213, 225, 355, 449, 639, 675, 1065, 1347, 1775, 1917, 2245, 3195, 4041, 5325, 6735, 9585, 11225, 12123, 15975, 20205, 31879, 33675, 47925, 60615, 95637, 101025, 159395, 286911, 303075, 478185, 796975, 860733, 1434555, 2390925, 4303665, 7172775, 21518325]

約数ペア:

[(1, 21518325), (3, 7172775), (5, 4303665), (9, 2390925), (15, 1434555), (25, 860733), (27, 796975), (45, 478185), (71, 303075), (75, 286911), (135, 159395), (213, 101025), (225, 95637), (355, 60615), (449, 47925), (639, 33675), (675, 31879), (1065, 20205), (1347, 15975), (1775, 12123), (1917, 11225), (2245, 9585), (3195, 6735), (4041, 5325)]