21217455

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{193}}^1\times {\mathrm{349}}^1$

素因数の和:560

約数の個数: 48

約数和(自身を含む): 42369600

約数和(自身を除く): 21152145

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 193, 315, 349, 579, 965, 1047, 1351, 1737, 1745, 2443, 2895, 3141, 4053, 5235, 6755, 7329, 8685, 12159, 12215, 15705, 20265, 21987, 36645, 60795, 67357, 109935, 202071, 336785, 471499, 606213, 1010355, 1414497, 2357495, 3031065, 4243491, 7072485, 21217455]

約数ペア:

[(1, 21217455), (3, 7072485), (5, 4243491), (7, 3031065), (9, 2357495), (15, 1414497), (21, 1010355), (35, 606213), (45, 471499), (63, 336785), (105, 202071), (193, 109935), (315, 67357), (349, 60795), (579, 36645), (965, 21987), (1047, 20265), (1351, 15705), (1737, 12215), (1745, 12159), (2443, 8685), (2895, 7329), (3141, 6755), (4053, 5235)]