21295305

素因数分解:

$3^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{1031}}^1$

素因数の和:1068

約数の個数: 48

約数和(自身を含む): 40569984

約数和(自身を除く): 19274679

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 81, 85, 135, 153, 243, 255, 405, 459, 765, 1031, 1215, 1377, 2295, 3093, 4131, 5155, 6885, 9279, 15465, 17527, 20655, 27837, 46395, 52581, 83511, 87635, 139185, 157743, 250533, 262905, 417555, 473229, 788715, 1252665, 1419687, 2366145, 4259061, 7098435, 21295305]

約数ペア:

[(1, 21295305), (3, 7098435), (5, 4259061), (9, 2366145), (15, 1419687), (17, 1252665), (27, 788715), (45, 473229), (51, 417555), (81, 262905), (85, 250533), (135, 157743), (153, 139185), (243, 87635), (255, 83511), (405, 52581), (459, 46395), (765, 27837), (1031, 20655), (1215, 17527), (1377, 15465), (2295, 9279), (3093, 6885), (4131, 5155)]