21780550

素因数分解:

$2^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{199}}^2$

素因数の和:421

約数の個数: 36

約数和(自身を含む): 44417916

約数和(自身を除く): 22637366

約数列:

[1, 2, 5, 10, 11, 22, 25, 50, 55, 110, 199, 275, 398, 550, 995, 1990, 2189, 4378, 4975, 9950, 10945, 21890, 39601, 54725, 79202, 109450, 198005, 396010, 435611, 871222, 990025, 1980050, 2178055, 4356110, 10890275, 21780550]

約数ペア:

[(1, 21780550), (2, 10890275), (5, 4356110), (10, 2178055), (11, 1980050), (22, 990025), (25, 871222), (50, 435611), (55, 396010), (110, 198005), (199, 109450), (275, 79202), (398, 54725), (550, 39601), (995, 21890), (1990, 10945), (2189, 9950), (4378, 4975)]