20902980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{317}}^1$

素因数の和:493

約数の個数: 96

約数和(自身を含む): 67527936

約数和(自身を除く): 46624956

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 157, 210, 314, 317, 420, 471, 628, 634, 785, 942, 951, 1099, 1268, 1570, 1585, 1884, 1902, 2198, 2219, 2355, 3140, 3170, 3297, 3804, 4396, 4438, 4710, 4755, 5495, 6340, 6594, 6657, 8876, 9420, 9510, 10990, 11095, 13188, 13314, 16485, 19020, 21980, 22190, 26628, 32970, 33285, 44380, 49769, 65940, 66570, 99538, 133140, 149307, 199076, 248845, 298614, 348383, 497690, 597228, 696766, 746535, 995380, 1045149, 1393532, 1493070, 1741915, 2090298, 2986140, 3483830, 4180596, 5225745, 6967660, 10451490, 20902980]

約数ペア:

[(1, 20902980), (2, 10451490), (3, 6967660), (4, 5225745), (5, 4180596), (6, 3483830), (7, 2986140), (10, 2090298), (12, 1741915), (14, 1493070), (15, 1393532), (20, 1045149), (21, 995380), (28, 746535), (30, 696766), (35, 597228), (42, 497690), (60, 348383), (70, 298614), (84, 248845), (105, 199076), (140, 149307), (157, 133140), (210, 99538), (314, 66570), (317, 65940), (420, 49769), (471, 44380), (628, 33285), (634, 32970), (785, 26628), (942, 22190), (951, 21980), (1099, 19020), (1268, 16485), (1570, 13314), (1585, 13188), (1884, 11095), (1902, 10990), (2198, 9510), (2219, 9420), (2355, 8876), (3140, 6657), (3170, 6594), (3297, 6340), (3804, 5495), (4396, 4755), (4438, 4710)]