21288405

素因数分解:

$3^1\times 5^1\times {\mathrm{271}}^1\times {\mathrm{5237}}^1$

素因数の和:5516

約数の個数: 16

約数和(自身を含む): 34193664

約数和(自身を除く): 12905259

約数列:

[1, 3, 5, 15, 271, 813, 1355, 4065, 5237, 15711, 26185, 78555, 1419227, 4257681, 7096135, 21288405]

約数ペア:

[(1, 21288405), (3, 7096135), (5, 4257681), (15, 1419227), (271, 78555), (813, 26185), (1355, 15711), (4065, 5237)]