20905900

素因数分解:

$2^2\times 5^2\times {\mathrm{41}}^1\times {\mathrm{5099}}^1$

素因数の和:5154

約数の個数: 36

約数和(自身を含む): 46481400

約数和(自身を除く): 25575500

約数列:

[1, 2, 4, 5, 10, 20, 25, 41, 50, 82, 100, 164, 205, 410, 820, 1025, 2050, 4100, 5099, 10198, 20396, 25495, 50990, 101980, 127475, 209059, 254950, 418118, 509900, 836236, 1045295, 2090590, 4181180, 5226475, 10452950, 20905900]

約数ペア:

[(1, 20905900), (2, 10452950), (4, 5226475), (5, 4181180), (10, 2090590), (20, 1045295), (25, 836236), (41, 509900), (50, 418118), (82, 254950), (100, 209059), (164, 127475), (205, 101980), (410, 50990), (820, 25495), (1025, 20396), (2050, 10198), (4100, 5099)]