20561990

素因数分解:

$2^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{3491}}^1$

素因数の和:3548

約数の個数: 32

約数和(自身を含む): 40227840

約数和(自身を除く): 19665850

約数列:

[1, 2, 5, 10, 19, 31, 38, 62, 95, 155, 190, 310, 589, 1178, 2945, 3491, 5890, 6982, 17455, 34910, 66329, 108221, 132658, 216442, 331645, 541105, 663290, 1082210, 2056199, 4112398, 10280995, 20561990]

約数ペア:

[(1, 20561990), (2, 10280995), (5, 4112398), (10, 2056199), (19, 1082210), (31, 663290), (38, 541105), (62, 331645), (95, 216442), (155, 132658), (190, 108221), (310, 66329), (589, 34910), (1178, 17455), (2945, 6982), (3491, 5890)]