21013780

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{73}}^1\times {\mathrm{389}}^1$

素因数の和:508

約数の個数: 48

約数和(自身を含む): 46060560

約数和(自身を除く): 25046780

約数列:

[1, 2, 4, 5, 10, 20, 37, 73, 74, 146, 148, 185, 292, 365, 370, 389, 730, 740, 778, 1460, 1556, 1945, 2701, 3890, 5402, 7780, 10804, 13505, 14393, 27010, 28397, 28786, 54020, 56794, 57572, 71965, 113588, 141985, 143930, 283970, 287860, 567940, 1050689, 2101378, 4202756, 5253445, 10506890, 21013780]

約数ペア:

[(1, 21013780), (2, 10506890), (4, 5253445), (5, 4202756), (10, 2101378), (20, 1050689), (37, 567940), (73, 287860), (74, 283970), (146, 143930), (148, 141985), (185, 113588), (292, 71965), (365, 57572), (370, 56794), (389, 54020), (730, 28786), (740, 28397), (778, 27010), (1460, 14393), (1556, 13505), (1945, 10804), (2701, 7780), (3890, 5402)]