21272875

素因数分解:

$5^3\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{53}}^1$

素因数の和:113

約数の個数: 48

約数和(自身を含む): 30831840

約数和(自身を除く): 9558965

約数列:

[1, 5, 13, 19, 25, 53, 65, 95, 125, 169, 247, 265, 325, 475, 689, 845, 1007, 1235, 1325, 1625, 2375, 3211, 3445, 4225, 5035, 6175, 6625, 8957, 13091, 16055, 17225, 21125, 25175, 30875, 44785, 65455, 80275, 86125, 125875, 170183, 223925, 327275, 401375, 850915, 1119625, 1636375, 4254575, 21272875]

約数ペア:

[(1, 21272875), (5, 4254575), (13, 1636375), (19, 1119625), (25, 850915), (53, 401375), (65, 327275), (95, 223925), (125, 170183), (169, 125875), (247, 86125), (265, 80275), (325, 65455), (475, 44785), (689, 30875), (845, 25175), (1007, 21125), (1235, 17225), (1325, 16055), (1625, 13091), (2375, 8957), (3211, 6625), (3445, 6175), (4225, 5035)]