21565775

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{659}}^1$

素因数の和:704

約数の個数: 48

約数和(自身を含む): 35354880

約数和(自身を除く): 13789105

約数列:

[1, 5, 7, 11, 17, 25, 35, 55, 77, 85, 119, 175, 187, 275, 385, 425, 595, 659, 935, 1309, 1925, 2975, 3295, 4613, 4675, 6545, 7249, 11203, 16475, 23065, 32725, 36245, 50743, 56015, 78421, 115325, 123233, 181225, 253715, 280075, 392105, 616165, 862631, 1268575, 1960525, 3080825, 4313155, 21565775]

約数ペア:

[(1, 21565775), (5, 4313155), (7, 3080825), (11, 1960525), (17, 1268575), (25, 862631), (35, 616165), (55, 392105), (77, 280075), (85, 253715), (119, 181225), (175, 123233), (187, 115325), (275, 78421), (385, 56015), (425, 50743), (595, 36245), (659, 32725), (935, 23065), (1309, 16475), (1925, 11203), (2975, 7249), (3295, 6545), (4613, 4675)]