21721161

素因数分解:

$3^1\times 7^3\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1$

素因数の和:155

約数の個数: 64

約数和(自身を含む): 39168000

約数和(自身を除く): 17446839

約数列:

[1, 3, 7, 11, 19, 21, 33, 49, 57, 77, 101, 133, 147, 209, 231, 303, 343, 399, 539, 627, 707, 931, 1029, 1111, 1463, 1617, 1919, 2121, 2793, 3333, 3773, 4389, 4949, 5757, 6517, 7777, 10241, 11319, 13433, 14847, 19551, 21109, 23331, 30723, 34643, 40299, 54439, 63327, 71687, 94031, 103929, 147763, 163317, 215061, 282093, 381073, 443289, 658217, 1034341, 1143219, 1974651, 3103023, 7240387, 21721161]

約数ペア:

[(1, 21721161), (3, 7240387), (7, 3103023), (11, 1974651), (19, 1143219), (21, 1034341), (33, 658217), (49, 443289), (57, 381073), (77, 282093), (101, 215061), (133, 163317), (147, 147763), (209, 103929), (231, 94031), (303, 71687), (343, 63327), (399, 54439), (539, 40299), (627, 34643), (707, 30723), (931, 23331), (1029, 21109), (1111, 19551), (1463, 14847), (1617, 13433), (1919, 11319), (2121, 10241), (2793, 7777), (3333, 6517), (3773, 5757), (4389, 4949)]