21428120

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{743}}^1$

素因数の和:864

約数の個数: 64

約数和(自身を含む): 55710720

約数和(自身を除く): 34282600

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 103, 140, 206, 280, 412, 515, 721, 743, 824, 1030, 1442, 1486, 2060, 2884, 2972, 3605, 3715, 4120, 5201, 5768, 5944, 7210, 7430, 10402, 14420, 14860, 20804, 26005, 28840, 29720, 41608, 52010, 76529, 104020, 153058, 208040, 306116, 382645, 535703, 612232, 765290, 1071406, 1530580, 2142812, 2678515, 3061160, 4285624, 5357030, 10714060, 21428120]

約数ペア:

[(1, 21428120), (2, 10714060), (4, 5357030), (5, 4285624), (7, 3061160), (8, 2678515), (10, 2142812), (14, 1530580), (20, 1071406), (28, 765290), (35, 612232), (40, 535703), (56, 382645), (70, 306116), (103, 208040), (140, 153058), (206, 104020), (280, 76529), (412, 52010), (515, 41608), (721, 29720), (743, 28840), (824, 26005), (1030, 20804), (1442, 14860), (1486, 14420), (2060, 10402), (2884, 7430), (2972, 7210), (3605, 5944), (3715, 5768), (4120, 5201)]