21105765

素因数分解:

$3^5\times 5^1\times {\mathrm{29}}^1\times {\mathrm{599}}^1$

素因数の和:648

約数の個数: 48

約数和(自身を含む): 39312000

約数和(自身を除く): 18206235

約数列:

[1, 3, 5, 9, 15, 27, 29, 45, 81, 87, 135, 145, 243, 261, 405, 435, 599, 783, 1215, 1305, 1797, 2349, 2995, 3915, 5391, 7047, 8985, 11745, 16173, 17371, 26955, 35235, 48519, 52113, 80865, 86855, 145557, 156339, 242595, 260565, 469017, 727785, 781695, 1407051, 2345085, 4221153, 7035255, 21105765]

約数ペア:

[(1, 21105765), (3, 7035255), (5, 4221153), (9, 2345085), (15, 1407051), (27, 781695), (29, 727785), (45, 469017), (81, 260565), (87, 242595), (135, 156339), (145, 145557), (243, 86855), (261, 80865), (405, 52113), (435, 48519), (599, 35235), (783, 26955), (1215, 17371), (1305, 16173), (1797, 11745), (2349, 8985), (2995, 7047), (3915, 5391)]