21408865

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{4129}}^1$

素因数の和:4212

約数の個数: 16

約数和(自身を含む): 27654480

約数和(自身を除く): 6245615

約数列:

[1, 5, 17, 61, 85, 305, 1037, 4129, 5185, 20645, 70193, 251869, 350965, 1259345, 4281773, 21408865]

約数ペア:

[(1, 21408865), (5, 4281773), (17, 1259345), (61, 350965), (85, 251869), (305, 70193), (1037, 20645), (4129, 5185)]