21506960

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{83}}^1$

素因数の和:216

約数の個数: 80

約数和(自身を含む): 52496640

約数和(自身を除く): 30989680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 79, 80, 82, 83, 158, 164, 166, 205, 316, 328, 332, 395, 410, 415, 632, 656, 664, 790, 820, 830, 1264, 1328, 1580, 1640, 1660, 3160, 3239, 3280, 3320, 3403, 6320, 6478, 6557, 6640, 6806, 12956, 13114, 13612, 16195, 17015, 25912, 26228, 27224, 32390, 32785, 34030, 51824, 52456, 54448, 64780, 65570, 68060, 104912, 129560, 131140, 136120, 259120, 262280, 268837, 272240, 524560, 537674, 1075348, 1344185, 2150696, 2688370, 4301392, 5376740, 10753480, 21506960]

約数ペア:

[(1, 21506960), (2, 10753480), (4, 5376740), (5, 4301392), (8, 2688370), (10, 2150696), (16, 1344185), (20, 1075348), (40, 537674), (41, 524560), (79, 272240), (80, 268837), (82, 262280), (83, 259120), (158, 136120), (164, 131140), (166, 129560), (205, 104912), (316, 68060), (328, 65570), (332, 64780), (395, 54448), (410, 52456), (415, 51824), (632, 34030), (656, 32785), (664, 32390), (790, 27224), (820, 26228), (830, 25912), (1264, 17015), (1328, 16195), (1580, 13612), (1640, 13114), (1660, 12956), (3160, 6806), (3239, 6640), (3280, 6557), (3320, 6478), (3403, 6320)]