21357405

素因数分解:

$3^3\times 5^1\times {\mathrm{281}}^1\times {\mathrm{563}}^1$

素因数の和:858

約数の個数: 32

約数和(自身を含む): 38171520

約数和(自身を除く): 16814115

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 281, 563, 843, 1405, 1689, 2529, 2815, 4215, 5067, 7587, 8445, 12645, 15201, 25335, 37935, 76005, 158203, 474609, 791015, 1423827, 2373045, 4271481, 7119135, 21357405]

約数ペア:

[(1, 21357405), (3, 7119135), (5, 4271481), (9, 2373045), (15, 1423827), (27, 791015), (45, 474609), (135, 158203), (281, 76005), (563, 37935), (843, 25335), (1405, 15201), (1689, 12645), (2529, 8445), (2815, 7587), (4215, 5067)]