20951205

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{163}}^1$

素因数の和:242

約数の個数: 64

約数和(自身を含む): 39674880

約数和(自身を除く): 18723675

約数列:

[1, 3, 5, 11, 15, 19, 33, 41, 55, 57, 95, 123, 163, 165, 205, 209, 285, 451, 489, 615, 627, 779, 815, 1045, 1353, 1793, 2255, 2337, 2445, 3097, 3135, 3895, 5379, 6683, 6765, 8569, 8965, 9291, 11685, 15485, 20049, 25707, 26895, 33415, 34067, 42845, 46455, 73513, 100245, 102201, 126977, 128535, 170335, 220539, 367565, 380931, 511005, 634885, 1102695, 1396747, 1904655, 4190241, 6983735, 20951205]

約数ペア:

[(1, 20951205), (3, 6983735), (5, 4190241), (11, 1904655), (15, 1396747), (19, 1102695), (33, 634885), (41, 511005), (55, 380931), (57, 367565), (95, 220539), (123, 170335), (163, 128535), (165, 126977), (205, 102201), (209, 100245), (285, 73513), (451, 46455), (489, 42845), (615, 34067), (627, 33415), (779, 26895), (815, 25707), (1045, 20049), (1353, 15485), (1793, 11685), (2255, 9291), (2337, 8965), (2445, 8569), (3097, 6765), (3135, 6683), (3895, 5379)]