21492740

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1\times {\mathrm{223}}^1$

素因数の和:372

約数の個数: 48

約数和(自身を含む): 46663680

約数和(自身を除く): 25170940

約数列:

[1, 2, 4, 5, 10, 20, 61, 79, 122, 158, 223, 244, 305, 316, 395, 446, 610, 790, 892, 1115, 1220, 1580, 2230, 4460, 4819, 9638, 13603, 17617, 19276, 24095, 27206, 35234, 48190, 54412, 68015, 70468, 88085, 96380, 136030, 176170, 272060, 352340, 1074637, 2149274, 4298548, 5373185, 10746370, 21492740]

約数ペア:

[(1, 21492740), (2, 10746370), (4, 5373185), (5, 4298548), (10, 2149274), (20, 1074637), (61, 352340), (79, 272060), (122, 176170), (158, 136030), (223, 96380), (244, 88085), (305, 70468), (316, 68015), (395, 54412), (446, 48190), (610, 35234), (790, 27206), (892, 24095), (1115, 19276), (1220, 17617), (1580, 13603), (2230, 9638), (4460, 4819)]