21729981

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{83}}^1\times {\mathrm{137}}^1$

素因数の和:250

約数の個数: 48

約数和(自身を含む): 37001664

約数和(自身を除く): 15271683

約数列:

[1, 3, 7, 13, 21, 39, 49, 83, 91, 137, 147, 249, 273, 411, 581, 637, 959, 1079, 1743, 1781, 1911, 2877, 3237, 4067, 5343, 6713, 7553, 11371, 12201, 12467, 20139, 22659, 34113, 37401, 52871, 79597, 87269, 147823, 158613, 238791, 261807, 443469, 557179, 1034761, 1671537, 3104283, 7243327, 21729981]

約数ペア:

[(1, 21729981), (3, 7243327), (7, 3104283), (13, 1671537), (21, 1034761), (39, 557179), (49, 443469), (83, 261807), (91, 238791), (137, 158613), (147, 147823), (249, 87269), (273, 79597), (411, 52871), (581, 37401), (637, 34113), (959, 22659), (1079, 20139), (1743, 12467), (1781, 12201), (1911, 11371), (2877, 7553), (3237, 6713), (4067, 5343)]