20907978

素因数分解:

$2^1\times 3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{149}}^1\times {\mathrm{257}}^1$

素因数の和:431

約数の個数: 64

約数和(自身を含む): 52012800

約数和(自身を除く): 31104822

約数列:

[1, 2, 3, 6, 7, 13, 14, 21, 26, 39, 42, 78, 91, 149, 182, 257, 273, 298, 447, 514, 546, 771, 894, 1043, 1542, 1799, 1937, 2086, 3129, 3341, 3598, 3874, 5397, 5811, 6258, 6682, 10023, 10794, 11622, 13559, 20046, 23387, 27118, 38293, 40677, 46774, 70161, 76586, 81354, 114879, 140322, 229758, 268051, 497809, 536102, 804153, 995618, 1493427, 1608306, 2986854, 3484663, 6969326, 10453989, 20907978]

約数ペア:

[(1, 20907978), (2, 10453989), (3, 6969326), (6, 3484663), (7, 2986854), (13, 1608306), (14, 1493427), (21, 995618), (26, 804153), (39, 536102), (42, 497809), (78, 268051), (91, 229758), (149, 140322), (182, 114879), (257, 81354), (273, 76586), (298, 70161), (447, 46774), (514, 40677), (546, 38293), (771, 27118), (894, 23387), (1043, 20046), (1542, 13559), (1799, 11622), (1937, 10794), (2086, 10023), (3129, 6682), (3341, 6258), (3598, 5811), (3874, 5397)]