199957780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{8999}}^1$

素因数の和:9120

約数の個数: 48

約数和(自身を含む): 462672000

約数和(自身を除く): 262714220

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 101, 110, 202, 220, 404, 505, 1010, 1111, 2020, 2222, 4444, 5555, 8999, 11110, 17998, 22220, 35996, 44995, 89990, 98989, 179980, 197978, 395956, 494945, 908899, 989890, 1817798, 1979780, 3635596, 4544495, 9088990, 9997889, 18177980, 19995778, 39991556, 49989445, 99978890, 199957780]

約数ペア:

[(1, 199957780), (2, 99978890), (4, 49989445), (5, 39991556), (10, 19995778), (11, 18177980), (20, 9997889), (22, 9088990), (44, 4544495), (55, 3635596), (101, 1979780), (110, 1817798), (202, 989890), (220, 908899), (404, 494945), (505, 395956), (1010, 197978), (1111, 179980), (2020, 98989), (2222, 89990), (4444, 44995), (5555, 35996), (8999, 22220), (11110, 17998)]