21991490

素因数分解:

$2^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{199}}^1\times {\mathrm{257}}^1$

素因数の和:506

約数の個数: 32

約数和(自身を含む): 40867200

約数和(自身を除く): 18875710

約数列:

[1, 2, 5, 10, 43, 86, 199, 215, 257, 398, 430, 514, 995, 1285, 1990, 2570, 8557, 11051, 17114, 22102, 42785, 51143, 55255, 85570, 102286, 110510, 255715, 511430, 2199149, 4398298, 10995745, 21991490]

約数ペア:

[(1, 21991490), (2, 10995745), (5, 4398298), (10, 2199149), (43, 511430), (86, 255715), (199, 110510), (215, 102286), (257, 85570), (398, 55255), (430, 51143), (514, 42785), (995, 22102), (1285, 17114), (1990, 11051), (2570, 8557)]