21279780

素因数分解:

$2^2\times 3^3\times 5^1\times {\mathrm{157}}^1\times {\mathrm{251}}^1$

素因数の和:426

約数の個数: 96

約数和(自身を含む): 66890880

約数和(自身を除く): 45611100

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 90, 108, 135, 157, 180, 251, 270, 314, 471, 502, 540, 628, 753, 785, 942, 1004, 1255, 1413, 1506, 1570, 1884, 2259, 2355, 2510, 2826, 3012, 3140, 3765, 4239, 4518, 4710, 5020, 5652, 6777, 7065, 7530, 8478, 9036, 9420, 11295, 13554, 14130, 15060, 16956, 21195, 22590, 27108, 28260, 33885, 39407, 42390, 45180, 67770, 78814, 84780, 118221, 135540, 157628, 197035, 236442, 354663, 394070, 472884, 591105, 709326, 788140, 1063989, 1182210, 1418652, 1773315, 2127978, 2364420, 3546630, 4255956, 5319945, 7093260, 10639890, 21279780]

約数ペア:

[(1, 21279780), (2, 10639890), (3, 7093260), (4, 5319945), (5, 4255956), (6, 3546630), (9, 2364420), (10, 2127978), (12, 1773315), (15, 1418652), (18, 1182210), (20, 1063989), (27, 788140), (30, 709326), (36, 591105), (45, 472884), (54, 394070), (60, 354663), (90, 236442), (108, 197035), (135, 157628), (157, 135540), (180, 118221), (251, 84780), (270, 78814), (314, 67770), (471, 45180), (502, 42390), (540, 39407), (628, 33885), (753, 28260), (785, 27108), (942, 22590), (1004, 21195), (1255, 16956), (1413, 15060), (1506, 14130), (1570, 13554), (1884, 11295), (2259, 9420), (2355, 9036), (2510, 8478), (2826, 7530), (3012, 7065), (3140, 6777), (3765, 5652), (4239, 5020), (4518, 4710)]