21187280

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{263}}^1$

素因数の和:348

約数の個数: 80

約数和(自身を含む): 53032320

約数和(自身を除く): 31845040

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 53, 76, 80, 95, 106, 152, 190, 212, 263, 265, 304, 380, 424, 526, 530, 760, 848, 1007, 1052, 1060, 1315, 1520, 2014, 2104, 2120, 2630, 4028, 4208, 4240, 4997, 5035, 5260, 8056, 9994, 10070, 10520, 13939, 16112, 19988, 20140, 21040, 24985, 27878, 39976, 40280, 49970, 55756, 69695, 79952, 80560, 99940, 111512, 139390, 199880, 223024, 264841, 278780, 399760, 529682, 557560, 1059364, 1115120, 1324205, 2118728, 2648410, 4237456, 5296820, 10593640, 21187280]

約数ペア:

[(1, 21187280), (2, 10593640), (4, 5296820), (5, 4237456), (8, 2648410), (10, 2118728), (16, 1324205), (19, 1115120), (20, 1059364), (38, 557560), (40, 529682), (53, 399760), (76, 278780), (80, 264841), (95, 223024), (106, 199880), (152, 139390), (190, 111512), (212, 99940), (263, 80560), (265, 79952), (304, 69695), (380, 55756), (424, 49970), (526, 40280), (530, 39976), (760, 27878), (848, 24985), (1007, 21040), (1052, 20140), (1060, 19988), (1315, 16112), (1520, 13939), (2014, 10520), (2104, 10070), (2120, 9994), (2630, 8056), (4028, 5260), (4208, 5035), (4240, 4997)]