21979665

素因数分解:

$3^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{307}}^1$

素因数の和:398

約数の個数: 48

約数和(自身を含む): 40168128

約数和(自身を除く): 18188463

約数列:

[1, 3, 5, 9, 15, 37, 43, 45, 111, 129, 185, 215, 307, 333, 387, 555, 645, 921, 1535, 1591, 1665, 1935, 2763, 4605, 4773, 7955, 11359, 13201, 13815, 14319, 23865, 34077, 39603, 56795, 66005, 71595, 102231, 118809, 170385, 198015, 488437, 511155, 594045, 1465311, 2442185, 4395933, 7326555, 21979665]

約数ペア:

[(1, 21979665), (3, 7326555), (5, 4395933), (9, 2442185), (15, 1465311), (37, 594045), (43, 511155), (45, 488437), (111, 198015), (129, 170385), (185, 118809), (215, 102231), (307, 71595), (333, 66005), (387, 56795), (555, 39603), (645, 34077), (921, 23865), (1535, 14319), (1591, 13815), (1665, 13201), (1935, 11359), (2763, 7955), (4605, 4773)]