9781780

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{151}}^1$

素因数の和:280

約数の個数: 48

約数和(自身を含む): 21450240

約数和(自身を除く): 11668460

約数列:

[1, 2, 4, 5, 10, 20, 41, 79, 82, 151, 158, 164, 205, 302, 316, 395, 410, 604, 755, 790, 820, 1510, 1580, 3020, 3239, 6191, 6478, 11929, 12382, 12956, 16195, 23858, 24764, 30955, 32390, 47716, 59645, 61910, 64780, 119290, 123820, 238580, 489089, 978178, 1956356, 2445445, 4890890, 9781780]

約数ペア:

[(1, 9781780), (2, 4890890), (4, 2445445), (5, 1956356), (10, 978178), (20, 489089), (41, 238580), (79, 123820), (82, 119290), (151, 64780), (158, 61910), (164, 59645), (205, 47716), (302, 32390), (316, 30955), (395, 24764), (410, 23858), (604, 16195), (755, 12956), (790, 12382), (820, 11929), (1510, 6478), (1580, 6191), (3020, 3239)]