21291279560

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4883321}}^1$

素因数の和:4883441

約数の個数: 32

約数和(自身を含む): 48344887800

約数和(自身を除く): 27053608240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4883321, 9766642, 19533284, 24416605, 39066568, 48833210, 97666420, 195332840, 532281989, 1064563978, 2129127956, 2661409945, 4258255912, 5322819890, 10645639780, 21291279560]

約数ペア:

[(1, 21291279560), (2, 10645639780), (4, 5322819890), (5, 4258255912), (8, 2661409945), (10, 2129127956), (20, 1064563978), (40, 532281989), (109, 195332840), (218, 97666420), (436, 48833210), (545, 39066568), (872, 24416605), (1090, 19533284), (2180, 9766642), (4360, 4883321)]