80721220

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{101}}^1\times {\mathrm{449}}^1$

素因数の和:648

約数の個数: 48

約数和(自身を含む): 173502000

約数和(自身を除く): 92780780

約数列:

[1, 2, 4, 5, 10, 20, 89, 101, 178, 202, 356, 404, 445, 449, 505, 890, 898, 1010, 1780, 1796, 2020, 2245, 4490, 8980, 8989, 17978, 35956, 39961, 44945, 45349, 79922, 89890, 90698, 159844, 179780, 181396, 199805, 226745, 399610, 453490, 799220, 906980, 4036061, 8072122, 16144244, 20180305, 40360610, 80721220]

約数ペア:

[(1, 80721220), (2, 40360610), (4, 20180305), (5, 16144244), (10, 8072122), (20, 4036061), (89, 906980), (101, 799220), (178, 453490), (202, 399610), (356, 226745), (404, 199805), (445, 181396), (449, 179780), (505, 159844), (890, 90698), (898, 89890), (1010, 79922), (1780, 45349), (1796, 44945), (2020, 39961), (2245, 35956), (4490, 17978), (8980, 8989)]