28891191

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^2\times {\mathrm{37}}^1\times {\mathrm{103}}^1$

素因数の和:188

約数の個数: 48

約数和(自身を含む): 48182784

約数和(自身を除く): 19291593

約数列:

[1, 3, 7, 19, 21, 37, 57, 103, 111, 133, 259, 309, 361, 399, 703, 721, 777, 1083, 1957, 2109, 2163, 2527, 3811, 4921, 5871, 7581, 11433, 13357, 13699, 14763, 26677, 37183, 40071, 41097, 72409, 80031, 93499, 111549, 217227, 260281, 280497, 506863, 780843, 1375771, 1520589, 4127313, 9630397, 28891191]

約数ペア:

[(1, 28891191), (3, 9630397), (7, 4127313), (19, 1520589), (21, 1375771), (37, 780843), (57, 506863), (103, 280497), (111, 260281), (133, 217227), (259, 111549), (309, 93499), (361, 80031), (399, 72409), (703, 41097), (721, 40071), (777, 37183), (1083, 26677), (1957, 14763), (2109, 13699), (2163, 13357), (2527, 11433), (3811, 7581), (4921, 5871)]