17978000

素因数分解:

$2^4\times 5^3\times {\mathrm{89}}^1\times {\mathrm{101}}^1$

素因数の和:213

約数の個数: 80

約数和(自身を含む): 44394480

約数和(自身を除く): 26416480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 89, 100, 101, 125, 178, 200, 202, 250, 356, 400, 404, 445, 500, 505, 712, 808, 890, 1000, 1010, 1424, 1616, 1780, 2000, 2020, 2225, 2525, 3560, 4040, 4450, 5050, 7120, 8080, 8900, 8989, 10100, 11125, 12625, 17800, 17978, 20200, 22250, 25250, 35600, 35956, 40400, 44500, 44945, 50500, 71912, 89000, 89890, 101000, 143824, 178000, 179780, 202000, 224725, 359560, 449450, 719120, 898900, 1123625, 1797800, 2247250, 3595600, 4494500, 8989000, 17978000]

約数ペア:

[(1, 17978000), (2, 8989000), (4, 4494500), (5, 3595600), (8, 2247250), (10, 1797800), (16, 1123625), (20, 898900), (25, 719120), (40, 449450), (50, 359560), (80, 224725), (89, 202000), (100, 179780), (101, 178000), (125, 143824), (178, 101000), (200, 89890), (202, 89000), (250, 71912), (356, 50500), (400, 44945), (404, 44500), (445, 40400), (500, 35956), (505, 35600), (712, 25250), (808, 22250), (890, 20200), (1000, 17978), (1010, 17800), (1424, 12625), (1616, 11125), (1780, 10100), (2000, 8989), (2020, 8900), (2225, 8080), (2525, 7120), (3560, 5050), (4040, 4450)]