21266728

素因数分解:

$2^3\times 7^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{251}}^1$

素因数の和:370

約数の個数: 64

約数和(自身を含む): 48988800

約数和(自身を除く): 27722072

約数列:

[1, 2, 4, 7, 8, 14, 17, 28, 34, 56, 68, 89, 119, 136, 178, 238, 251, 356, 476, 502, 623, 712, 952, 1004, 1246, 1513, 1757, 2008, 2492, 3026, 3514, 4267, 4984, 6052, 7028, 8534, 10591, 12104, 14056, 17068, 21182, 22339, 29869, 34136, 42364, 44678, 59738, 84728, 89356, 119476, 156373, 178712, 238952, 312746, 379763, 625492, 759526, 1250984, 1519052, 2658341, 3038104, 5316682, 10633364, 21266728]

約数ペア:

[(1, 21266728), (2, 10633364), (4, 5316682), (7, 3038104), (8, 2658341), (14, 1519052), (17, 1250984), (28, 759526), (34, 625492), (56, 379763), (68, 312746), (89, 238952), (119, 178712), (136, 156373), (178, 119476), (238, 89356), (251, 84728), (356, 59738), (476, 44678), (502, 42364), (623, 34136), (712, 29869), (952, 22339), (1004, 21182), (1246, 17068), (1513, 14056), (1757, 12104), (2008, 10591), (2492, 8534), (3026, 7028), (3514, 6052), (4267, 4984)]