21216555

素因数分解:

$3^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{227}}^1$

素因数の和:336

約数の個数: 48

約数和(自身を含む): 38697984

約数和(自身を除く): 17481429

約数列:

[1, 3, 5, 9, 15, 31, 45, 67, 93, 155, 201, 227, 279, 335, 465, 603, 681, 1005, 1135, 1395, 2043, 2077, 3015, 3405, 6231, 7037, 10215, 10385, 15209, 18693, 21111, 31155, 35185, 45627, 63333, 76045, 93465, 105555, 136881, 228135, 316665, 471479, 684405, 1414437, 2357395, 4243311, 7072185, 21216555]

約数ペア:

[(1, 21216555), (3, 7072185), (5, 4243311), (9, 2357395), (15, 1414437), (31, 684405), (45, 471479), (67, 316665), (93, 228135), (155, 136881), (201, 105555), (227, 93465), (279, 76045), (335, 63333), (465, 45627), (603, 35185), (681, 31155), (1005, 21111), (1135, 18693), (1395, 15209), (2043, 10385), (2077, 10215), (3015, 7037), (3405, 6231)]