19987990

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^2\times {\mathrm{16519}}^1$

素因数の和:16548

約数の個数: 24

約数和(自身を含む): 39548880

約数和(自身を除く): 19560890

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 121, 242, 605, 1210, 16519, 33038, 82595, 165190, 181709, 363418, 908545, 1817090, 1998799, 3997598, 9993995, 19987990]

約数ペア:

[(1, 19987990), (2, 9993995), (5, 3997598), (10, 1998799), (11, 1817090), (22, 908545), (55, 363418), (110, 181709), (121, 165190), (242, 82595), (605, 33038), (1210, 16519)]