20718945

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{107}}^1\times {\mathrm{331}}^1$

素因数の和:462

約数の個数: 48

約数和(自身を含む): 39154752

約数和(自身を除く): 18435807

約数列:

[1, 3, 5, 9, 13, 15, 39, 45, 65, 107, 117, 195, 321, 331, 535, 585, 963, 993, 1391, 1605, 1655, 2979, 4173, 4303, 4815, 4965, 6955, 12519, 12909, 14895, 20865, 21515, 35417, 38727, 62595, 64545, 106251, 177085, 193635, 318753, 460421, 531255, 1381263, 1593765, 2302105, 4143789, 6906315, 20718945]

約数ペア:

[(1, 20718945), (3, 6906315), (5, 4143789), (9, 2302105), (13, 1593765), (15, 1381263), (39, 531255), (45, 460421), (65, 318753), (107, 193635), (117, 177085), (195, 106251), (321, 64545), (331, 62595), (535, 38727), (585, 35417), (963, 21515), (993, 20865), (1391, 14895), (1605, 12909), (1655, 12519), (2979, 6955), (4173, 4965), (4303, 4815)]