21080728

素因数分解:

$2^3\times {\mathrm{19}}^1\times {\mathrm{331}}^1\times {\mathrm{419}}^1$

素因数の和:775

約数の個数: 32

約数和(自身を含む): 41832000

約数和(自身を除く): 20751272

約数列:

[1, 2, 4, 8, 19, 38, 76, 152, 331, 419, 662, 838, 1324, 1676, 2648, 3352, 6289, 7961, 12578, 15922, 25156, 31844, 50312, 63688, 138689, 277378, 554756, 1109512, 2635091, 5270182, 10540364, 21080728]

約数ペア:

[(1, 21080728), (2, 10540364), (4, 5270182), (8, 2635091), (19, 1109512), (38, 554756), (76, 277378), (152, 138689), (331, 63688), (419, 50312), (662, 31844), (838, 25156), (1324, 15922), (1676, 12578), (2648, 7961), (3352, 6289)]