21678880

素因数分解:

$2^5\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{137}}^1$

素因数の和:218

約数の個数: 96

約数和(自身を含む): 55085184

約数和(自身を除く): 33406304

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 32, 40, 43, 46, 80, 86, 92, 115, 137, 160, 172, 184, 215, 230, 274, 344, 368, 430, 460, 548, 685, 688, 736, 860, 920, 989, 1096, 1370, 1376, 1720, 1840, 1978, 2192, 2740, 3151, 3440, 3680, 3956, 4384, 4945, 5480, 5891, 6302, 6880, 7912, 9890, 10960, 11782, 12604, 15755, 15824, 19780, 21920, 23564, 25208, 29455, 31510, 31648, 39560, 47128, 50416, 58910, 63020, 79120, 94256, 100832, 117820, 126040, 135493, 158240, 188512, 235640, 252080, 270986, 471280, 504160, 541972, 677465, 942560, 1083944, 1354930, 2167888, 2709860, 4335776, 5419720, 10839440, 21678880]

約数ペア:

[(1, 21678880), (2, 10839440), (4, 5419720), (5, 4335776), (8, 2709860), (10, 2167888), (16, 1354930), (20, 1083944), (23, 942560), (32, 677465), (40, 541972), (43, 504160), (46, 471280), (80, 270986), (86, 252080), (92, 235640), (115, 188512), (137, 158240), (160, 135493), (172, 126040), (184, 117820), (215, 100832), (230, 94256), (274, 79120), (344, 63020), (368, 58910), (430, 50416), (460, 47128), (548, 39560), (685, 31648), (688, 31510), (736, 29455), (860, 25208), (920, 23564), (989, 21920), (1096, 19780), (1370, 15824), (1376, 15755), (1720, 12604), (1840, 11782), (1978, 10960), (2192, 9890), (2740, 7912), (3151, 6880), (3440, 6302), (3680, 5891), (3956, 5480), (4384, 4945)]