21558825

素因数分解:

$3^3\times 5^2\times {\mathrm{19}}^1\times {\mathrm{41}}^2$

素因数の和:120

約数の個数: 72

約数和(自身を含む): 42730400

約数和(自身を除く): 21171575

約数列:

[1, 3, 5, 9, 15, 19, 25, 27, 41, 45, 57, 75, 95, 123, 135, 171, 205, 225, 285, 369, 475, 513, 615, 675, 779, 855, 1025, 1107, 1425, 1681, 1845, 2337, 2565, 3075, 3895, 4275, 5043, 5535, 7011, 8405, 9225, 11685, 12825, 15129, 19475, 21033, 25215, 27675, 31939, 35055, 42025, 45387, 58425, 75645, 95817, 105165, 126075, 159695, 175275, 226935, 287451, 378225, 479085, 525825, 798475, 862353, 1134675, 1437255, 2395425, 4311765, 7186275, 21558825]

約数ペア:

[(1, 21558825), (3, 7186275), (5, 4311765), (9, 2395425), (15, 1437255), (19, 1134675), (25, 862353), (27, 798475), (41, 525825), (45, 479085), (57, 378225), (75, 287451), (95, 226935), (123, 175275), (135, 159695), (171, 126075), (205, 105165), (225, 95817), (285, 75645), (369, 58425), (475, 45387), (513, 42025), (615, 35055), (675, 31939), (779, 27675), (855, 25215), (1025, 21033), (1107, 19475), (1425, 15129), (1681, 12825), (1845, 11685), (2337, 9225), (2565, 8405), (3075, 7011), (3895, 5535), (4275, 5043)]