20111120

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{131}}^1$

素因数の和:264

約数の個数: 80

約数和(自身を含む): 50086080

約数和(自身を除く): 29974960

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 101, 131, 152, 190, 202, 262, 304, 380, 404, 505, 524, 655, 760, 808, 1010, 1048, 1310, 1520, 1616, 1919, 2020, 2096, 2489, 2620, 3838, 4040, 4978, 5240, 7676, 8080, 9595, 9956, 10480, 12445, 13231, 15352, 19190, 19912, 24890, 26462, 30704, 38380, 39824, 49780, 52924, 66155, 76760, 99560, 105848, 132310, 153520, 199120, 211696, 251389, 264620, 502778, 529240, 1005556, 1058480, 1256945, 2011112, 2513890, 4022224, 5027780, 10055560, 20111120]

約数ペア:

[(1, 20111120), (2, 10055560), (4, 5027780), (5, 4022224), (8, 2513890), (10, 2011112), (16, 1256945), (19, 1058480), (20, 1005556), (38, 529240), (40, 502778), (76, 264620), (80, 251389), (95, 211696), (101, 199120), (131, 153520), (152, 132310), (190, 105848), (202, 99560), (262, 76760), (304, 66155), (380, 52924), (404, 49780), (505, 39824), (524, 38380), (655, 30704), (760, 26462), (808, 24890), (1010, 19912), (1048, 19190), (1310, 15352), (1520, 13231), (1616, 12445), (1919, 10480), (2020, 9956), (2096, 9595), (2489, 8080), (2620, 7676), (3838, 5240), (4040, 4978)]