21685180

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{241}}^1\times {\mathrm{409}}^1$

素因数の和:670

約数の個数: 48

約数和(自身を含む): 50006880

約数和(自身を除く): 28321700

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 241, 409, 482, 818, 964, 1205, 1636, 2045, 2410, 2651, 4090, 4499, 4820, 5302, 8180, 8998, 10604, 13255, 17996, 22495, 26510, 44990, 53020, 89980, 98569, 197138, 394276, 492845, 985690, 1084259, 1971380, 2168518, 4337036, 5421295, 10842590, 21685180]

約数ペア:

[(1, 21685180), (2, 10842590), (4, 5421295), (5, 4337036), (10, 2168518), (11, 1971380), (20, 1084259), (22, 985690), (44, 492845), (55, 394276), (110, 197138), (220, 98569), (241, 89980), (409, 53020), (482, 44990), (818, 26510), (964, 22495), (1205, 17996), (1636, 13255), (2045, 10604), (2410, 8998), (2651, 8180), (4090, 5302), (4499, 4820)]