28408900

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^2\times {\mathrm{41}}^2$

素因数の和:122

約数の個数: 81

約数和(自身を含む): 68422053

約数和(自身を除く): 40013153

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 41, 50, 52, 65, 82, 100, 130, 164, 169, 205, 260, 325, 338, 410, 533, 650, 676, 820, 845, 1025, 1066, 1300, 1681, 1690, 2050, 2132, 2665, 3362, 3380, 4100, 4225, 5330, 6724, 6929, 8405, 8450, 10660, 13325, 13858, 16810, 16900, 21853, 26650, 27716, 33620, 34645, 42025, 43706, 53300, 69290, 84050, 87412, 109265, 138580, 168100, 173225, 218530, 284089, 346450, 437060, 546325, 568178, 692900, 1092650, 1136356, 1420445, 2185300, 2840890, 5681780, 7102225, 14204450, 28408900]

約数ペア:

[(1, 28408900), (2, 14204450), (4, 7102225), (5, 5681780), (10, 2840890), (13, 2185300), (20, 1420445), (25, 1136356), (26, 1092650), (41, 692900), (50, 568178), (52, 546325), (65, 437060), (82, 346450), (100, 284089), (130, 218530), (164, 173225), (169, 168100), (205, 138580), (260, 109265), (325, 87412), (338, 84050), (410, 69290), (533, 53300), (650, 43706), (676, 42025), (820, 34645), (845, 33620), (1025, 27716), (1066, 26650), (1300, 21853), (1681, 16900), (1690, 16810), (2050, 13858), (2132, 13325), (2665, 10660), (3362, 8450), (3380, 8405), (4100, 6929), (4225, 6724)]