20511975

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{23}}^2\times {\mathrm{47}}^1$

素因数の和:117

約数の個数: 72

約数和(自身を含む): 39497472

約数和(自身を除く): 18985497

約数列:

[1, 3, 5, 11, 15, 23, 25, 33, 47, 55, 69, 75, 115, 141, 165, 235, 253, 275, 345, 517, 529, 575, 705, 759, 825, 1081, 1175, 1265, 1551, 1587, 1725, 2585, 2645, 3243, 3525, 3795, 5405, 5819, 6325, 7755, 7935, 11891, 12925, 13225, 16215, 17457, 18975, 24863, 27025, 29095, 35673, 38775, 39675, 59455, 74589, 81075, 87285, 124315, 145475, 178365, 273493, 297275, 372945, 436425, 621575, 820479, 891825, 1367465, 1864725, 4102395, 6837325, 20511975]

約数ペア:

[(1, 20511975), (3, 6837325), (5, 4102395), (11, 1864725), (15, 1367465), (23, 891825), (25, 820479), (33, 621575), (47, 436425), (55, 372945), (69, 297275), (75, 273493), (115, 178365), (141, 145475), (165, 124315), (235, 87285), (253, 81075), (275, 74589), (345, 59455), (517, 39675), (529, 38775), (575, 35673), (705, 29095), (759, 27025), (825, 24863), (1081, 18975), (1175, 17457), (1265, 16215), (1551, 13225), (1587, 12925), (1725, 11891), (2585, 7935), (2645, 7755), (3243, 6325), (3525, 5819), (3795, 5405)]