20045840

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{59}}^1\times {\mathrm{137}}^1$

素因数の和:240

約数の個数: 80

約数和(自身を含む): 49282560

約数和(自身を除く): 29236720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 59, 62, 80, 118, 124, 137, 155, 236, 248, 274, 295, 310, 472, 496, 548, 590, 620, 685, 944, 1096, 1180, 1240, 1370, 1829, 2192, 2360, 2480, 2740, 3658, 4247, 4720, 5480, 7316, 8083, 8494, 9145, 10960, 14632, 16166, 16988, 18290, 21235, 29264, 32332, 33976, 36580, 40415, 42470, 64664, 67952, 73160, 80830, 84940, 129328, 146320, 161660, 169880, 250573, 323320, 339760, 501146, 646640, 1002292, 1252865, 2004584, 2505730, 4009168, 5011460, 10022920, 20045840]

約数ペア:

[(1, 20045840), (2, 10022920), (4, 5011460), (5, 4009168), (8, 2505730), (10, 2004584), (16, 1252865), (20, 1002292), (31, 646640), (40, 501146), (59, 339760), (62, 323320), (80, 250573), (118, 169880), (124, 161660), (137, 146320), (155, 129328), (236, 84940), (248, 80830), (274, 73160), (295, 67952), (310, 64664), (472, 42470), (496, 40415), (548, 36580), (590, 33976), (620, 32332), (685, 29264), (944, 21235), (1096, 18290), (1180, 16988), (1240, 16166), (1370, 14632), (1829, 10960), (2192, 9145), (2360, 8494), (2480, 8083), (2740, 7316), (3658, 5480), (4247, 4720)]