20980180

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{137}}^1$

素因数の和:209

約数の個数: 96

約数和(自身を含む): 51932160

約数和(自身を除く): 30951980

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 31, 38, 52, 62, 65, 76, 95, 124, 130, 137, 155, 190, 247, 260, 274, 310, 380, 403, 494, 548, 589, 620, 685, 806, 988, 1178, 1235, 1370, 1612, 1781, 2015, 2356, 2470, 2603, 2740, 2945, 3562, 4030, 4247, 4940, 5206, 5890, 7124, 7657, 8060, 8494, 8905, 10412, 11780, 13015, 15314, 16988, 17810, 21235, 26030, 30628, 33839, 35620, 38285, 42470, 52060, 55211, 67678, 76570, 80693, 84940, 110422, 135356, 153140, 161386, 169195, 220844, 276055, 322772, 338390, 403465, 552110, 676780, 806930, 1049009, 1104220, 1613860, 2098018, 4196036, 5245045, 10490090, 20980180]

約数ペア:

[(1, 20980180), (2, 10490090), (4, 5245045), (5, 4196036), (10, 2098018), (13, 1613860), (19, 1104220), (20, 1049009), (26, 806930), (31, 676780), (38, 552110), (52, 403465), (62, 338390), (65, 322772), (76, 276055), (95, 220844), (124, 169195), (130, 161386), (137, 153140), (155, 135356), (190, 110422), (247, 84940), (260, 80693), (274, 76570), (310, 67678), (380, 55211), (403, 52060), (494, 42470), (548, 38285), (589, 35620), (620, 33839), (685, 30628), (806, 26030), (988, 21235), (1178, 17810), (1235, 16988), (1370, 15314), (1612, 13015), (1781, 11780), (2015, 10412), (2356, 8905), (2470, 8494), (2603, 8060), (2740, 7657), (2945, 7124), (3562, 5890), (4030, 5206), (4247, 4940)]