20707940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{43}}^1\times {\mathrm{199}}^1$

素因数の和:273

約数の個数: 72

約数和(自身を含む): 49156800

約数和(自身を除く): 28448860

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 43, 44, 55, 86, 110, 121, 172, 199, 215, 220, 242, 398, 430, 473, 484, 605, 796, 860, 946, 995, 1210, 1892, 1990, 2189, 2365, 2420, 3980, 4378, 4730, 5203, 8557, 8756, 9460, 10406, 10945, 17114, 20812, 21890, 24079, 26015, 34228, 42785, 43780, 48158, 52030, 85570, 94127, 96316, 104060, 120395, 171140, 188254, 240790, 376508, 470635, 481580, 941270, 1035397, 1882540, 2070794, 4141588, 5176985, 10353970, 20707940]

約数ペア:

[(1, 20707940), (2, 10353970), (4, 5176985), (5, 4141588), (10, 2070794), (11, 1882540), (20, 1035397), (22, 941270), (43, 481580), (44, 470635), (55, 376508), (86, 240790), (110, 188254), (121, 171140), (172, 120395), (199, 104060), (215, 96316), (220, 94127), (242, 85570), (398, 52030), (430, 48158), (473, 43780), (484, 42785), (605, 34228), (796, 26015), (860, 24079), (946, 21890), (995, 20812), (1210, 17114), (1892, 10945), (1990, 10406), (2189, 9460), (2365, 8756), (2420, 8557), (3980, 5203), (4378, 4730)]