639639

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1$

素因数の和:108

約数の個数: 48

約数和(自身を含む): 1257984

約数和(自身を除く): 618345

約数列:

[1, 3, 7, 9, 11, 13, 21, 33, 39, 63, 71, 77, 91, 99, 117, 143, 213, 231, 273, 429, 497, 639, 693, 781, 819, 923, 1001, 1287, 1491, 2343, 2769, 3003, 4473, 5467, 6461, 7029, 8307, 9009, 10153, 16401, 19383, 30459, 49203, 58149, 71071, 91377, 213213, 639639]

約数ペア:

[(1, 639639), (3, 213213), (7, 91377), (9, 71071), (11, 58149), (13, 49203), (21, 30459), (33, 19383), (39, 16401), (63, 10153), (71, 9009), (77, 8307), (91, 7029), (99, 6461), (117, 5467), (143, 4473), (213, 3003), (231, 2769), (273, 2343), (429, 1491), (497, 1287), (639, 1001), (693, 923), (781, 819)]