20416405

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{71}}^1\times {\mathrm{199}}^1$

素因数の和:309

約数の個数: 24

約数和(自身を含む): 26524800

約数和(自身を除く): 6108395

約数列:

[1, 5, 17, 71, 85, 199, 289, 355, 995, 1207, 1445, 3383, 6035, 14129, 16915, 20519, 57511, 70645, 102595, 240193, 287555, 1200965, 4083281, 20416405]

約数ペア:

[(1, 20416405), (5, 4083281), (17, 1200965), (71, 287555), (85, 240193), (199, 102595), (289, 70645), (355, 57511), (995, 20519), (1207, 16915), (1445, 14129), (3383, 6035)]