21757880

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{13267}}^1$

素因数の和:13319

約数の個数: 32

約数和(自身を含む): 50153040

約数和(自身を除く): 28395160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 13267, 26534, 53068, 66335, 106136, 132670, 265340, 530680, 543947, 1087894, 2175788, 2719735, 4351576, 5439470, 10878940, 21757880]

約数ペア:

[(1, 21757880), (2, 10878940), (4, 5439470), (5, 4351576), (8, 2719735), (10, 2175788), (20, 1087894), (40, 543947), (41, 530680), (82, 265340), (164, 132670), (205, 106136), (328, 66335), (410, 53068), (820, 26534), (1640, 13267)]