20481975

素因数分解:

$3^2\times 5^2\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{73}}^1$

素因数の和:161

約数の個数: 72

約数和(自身を含む): 39365040

約数和(自身を除く): 18883065

約数列:

[1, 3, 5, 9, 15, 25, 29, 43, 45, 73, 75, 87, 129, 145, 215, 219, 225, 261, 365, 387, 435, 645, 657, 725, 1075, 1095, 1247, 1305, 1825, 1935, 2117, 2175, 3139, 3225, 3285, 3741, 5475, 6235, 6351, 6525, 9417, 9675, 10585, 11223, 15695, 16425, 18705, 19053, 28251, 31175, 31755, 47085, 52925, 56115, 78475, 91031, 93525, 95265, 141255, 158775, 235425, 273093, 280575, 455155, 476325, 706275, 819279, 1365465, 2275775, 4096395, 6827325, 20481975]

約数ペア:

[(1, 20481975), (3, 6827325), (5, 4096395), (9, 2275775), (15, 1365465), (25, 819279), (29, 706275), (43, 476325), (45, 455155), (73, 280575), (75, 273093), (87, 235425), (129, 158775), (145, 141255), (215, 95265), (219, 93525), (225, 91031), (261, 78475), (365, 56115), (387, 52925), (435, 47085), (645, 31755), (657, 31175), (725, 28251), (1075, 19053), (1095, 18705), (1247, 16425), (1305, 15695), (1825, 11223), (1935, 10585), (2117, 9675), (2175, 9417), (3139, 6525), (3225, 6351), (3285, 6235), (3741, 5475)]