19786990

素因数分解:

$2^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{31}}^2\times {\mathrm{71}}^1$

素因数の和:169

約数の個数: 48

約数和(自身を含む): 38607840

約数和(自身を除く): 18820850

約数列:

[1, 2, 5, 10, 29, 31, 58, 62, 71, 142, 145, 155, 290, 310, 355, 710, 899, 961, 1798, 1922, 2059, 2201, 4118, 4402, 4495, 4805, 8990, 9610, 10295, 11005, 20590, 22010, 27869, 55738, 63829, 68231, 127658, 136462, 139345, 278690, 319145, 341155, 638290, 682310, 1978699, 3957398, 9893495, 19786990]

約数ペア:

[(1, 19786990), (2, 9893495), (5, 3957398), (10, 1978699), (29, 682310), (31, 638290), (58, 341155), (62, 319145), (71, 278690), (142, 139345), (145, 136462), (155, 127658), (290, 68231), (310, 63829), (355, 55738), (710, 27869), (899, 22010), (961, 20590), (1798, 11005), (1922, 10295), (2059, 9610), (2201, 8990), (4118, 4805), (4402, 4495)]