21351320

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^2\times {\mathrm{1847}}^1$

素因数の和:1892

約数の個数: 48

約数和(自身を含む): 51060240

約数和(自身を除く): 29708920

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 289, 340, 578, 680, 1156, 1445, 1847, 2312, 2890, 3694, 5780, 7388, 9235, 11560, 14776, 18470, 31399, 36940, 62798, 73880, 125596, 156995, 251192, 313990, 533783, 627980, 1067566, 1255960, 2135132, 2668915, 4270264, 5337830, 10675660, 21351320]

約数ペア:

[(1, 21351320), (2, 10675660), (4, 5337830), (5, 4270264), (8, 2668915), (10, 2135132), (17, 1255960), (20, 1067566), (34, 627980), (40, 533783), (68, 313990), (85, 251192), (136, 156995), (170, 125596), (289, 73880), (340, 62798), (578, 36940), (680, 31399), (1156, 18470), (1445, 14776), (1847, 11560), (2312, 9235), (2890, 7388), (3694, 5780)]