20421225

素因数分解:

$3^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{223}}^1$

素因数の和:287

約数の個数: 72

約数和(自身を含む): 41164032

約数和(自身を除く): 20742807

約数列:

[1, 3, 5, 9, 11, 15, 25, 33, 37, 45, 55, 75, 99, 111, 165, 185, 223, 225, 275, 333, 407, 495, 555, 669, 825, 925, 1115, 1221, 1665, 2007, 2035, 2453, 2475, 2775, 3345, 3663, 5575, 6105, 7359, 8251, 8325, 10035, 10175, 12265, 16725, 18315, 22077, 24753, 30525, 36795, 41255, 50175, 61325, 74259, 90761, 91575, 110385, 123765, 183975, 206275, 272283, 371295, 453805, 551925, 618825, 816849, 1361415, 1856475, 2269025, 4084245, 6807075, 20421225]

約数ペア:

[(1, 20421225), (3, 6807075), (5, 4084245), (9, 2269025), (11, 1856475), (15, 1361415), (25, 816849), (33, 618825), (37, 551925), (45, 453805), (55, 371295), (75, 272283), (99, 206275), (111, 183975), (165, 123765), (185, 110385), (223, 91575), (225, 90761), (275, 74259), (333, 61325), (407, 50175), (495, 41255), (555, 36795), (669, 30525), (825, 24753), (925, 22077), (1115, 18315), (1221, 16725), (1665, 12265), (2007, 10175), (2035, 10035), (2453, 8325), (2475, 8251), (2775, 7359), (3345, 6105), (3663, 5575)]