21155379

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{1433}}^1$

素因数の和:1499

約数の個数: 32

約数和(自身を含む): 34874880

約数和(自身を除く): 13719501

約数列:

[1, 3, 7, 19, 21, 37, 57, 111, 133, 259, 399, 703, 777, 1433, 2109, 4299, 4921, 10031, 14763, 27227, 30093, 53021, 81681, 159063, 190589, 371147, 571767, 1007399, 1113441, 3022197, 7051793, 21155379]

約数ペア:

[(1, 21155379), (3, 7051793), (7, 3022197), (19, 1113441), (21, 1007399), (37, 571767), (57, 371147), (111, 190589), (133, 159063), (259, 81681), (399, 53021), (703, 30093), (777, 27227), (1433, 14763), (2109, 10031), (4299, 4921)]