21157520

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{331}}^1$

素因数の和:408

約数の個数: 80

約数和(自身を含む): 53353728

約数和(自身を除く): 32196208

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 47, 68, 80, 85, 94, 136, 170, 188, 235, 272, 331, 340, 376, 470, 662, 680, 752, 799, 940, 1324, 1360, 1598, 1655, 1880, 2648, 3196, 3310, 3760, 3995, 5296, 5627, 6392, 6620, 7990, 11254, 12784, 13240, 15557, 15980, 22508, 26480, 28135, 31114, 31960, 45016, 56270, 62228, 63920, 77785, 90032, 112540, 124456, 155570, 225080, 248912, 264469, 311140, 450160, 528938, 622280, 1057876, 1244560, 1322345, 2115752, 2644690, 4231504, 5289380, 10578760, 21157520]

約数ペア:

[(1, 21157520), (2, 10578760), (4, 5289380), (5, 4231504), (8, 2644690), (10, 2115752), (16, 1322345), (17, 1244560), (20, 1057876), (34, 622280), (40, 528938), (47, 450160), (68, 311140), (80, 264469), (85, 248912), (94, 225080), (136, 155570), (170, 124456), (188, 112540), (235, 90032), (272, 77785), (331, 63920), (340, 62228), (376, 56270), (470, 45016), (662, 31960), (680, 31114), (752, 28135), (799, 26480), (940, 22508), (1324, 15980), (1360, 15557), (1598, 13240), (1655, 12784), (1880, 11254), (2648, 7990), (3196, 6620), (3310, 6392), (3760, 5627), (3995, 5296)]