21456981

素因数分解:

$3^4\times 7^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1$

素因数の和:144

約数の個数: 80

約数和(自身を含む): 40981248

約数和(自身を除く): 19524267

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 41, 63, 71, 81, 91, 117, 123, 189, 213, 273, 287, 351, 369, 497, 533, 567, 639, 819, 861, 923, 1053, 1107, 1491, 1599, 1917, 2457, 2583, 2769, 2911, 3321, 3731, 4473, 4797, 5751, 6461, 7371, 7749, 8307, 8733, 11193, 13419, 14391, 19383, 20377, 23247, 24921, 26199, 33579, 37843, 40257, 43173, 58149, 61131, 74763, 78597, 100737, 113529, 174447, 183393, 235791, 264901, 302211, 340587, 523341, 550179, 794703, 1021761, 1650537, 2384109, 3065283, 7152327, 21456981]

約数ペア:

[(1, 21456981), (3, 7152327), (7, 3065283), (9, 2384109), (13, 1650537), (21, 1021761), (27, 794703), (39, 550179), (41, 523341), (63, 340587), (71, 302211), (81, 264901), (91, 235791), (117, 183393), (123, 174447), (189, 113529), (213, 100737), (273, 78597), (287, 74763), (351, 61131), (369, 58149), (497, 43173), (533, 40257), (567, 37843), (639, 33579), (819, 26199), (861, 24921), (923, 23247), (1053, 20377), (1107, 19383), (1491, 14391), (1599, 13419), (1917, 11193), (2457, 8733), (2583, 8307), (2769, 7749), (2911, 7371), (3321, 6461), (3731, 5751), (4473, 4797)]