21254660

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{967}}^1$

素因数の和:1140

約数の個数: 48

約数和(自身を含む): 51389184

約数和(自身を除く): 30134524

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157, 314, 628, 785, 967, 1099, 1570, 1934, 2198, 3140, 3868, 4396, 4835, 5495, 6769, 9670, 10990, 13538, 19340, 21980, 27076, 33845, 67690, 135380, 151819, 303638, 607276, 759095, 1062733, 1518190, 2125466, 3036380, 4250932, 5313665, 10627330, 21254660]

約数ペア:

[(1, 21254660), (2, 10627330), (4, 5313665), (5, 4250932), (7, 3036380), (10, 2125466), (14, 1518190), (20, 1062733), (28, 759095), (35, 607276), (70, 303638), (140, 151819), (157, 135380), (314, 67690), (628, 33845), (785, 27076), (967, 21980), (1099, 19340), (1570, 13538), (1934, 10990), (2198, 9670), (3140, 6769), (3868, 5495), (4396, 4835)]