21238820

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{59}}^1\times {\mathrm{439}}^1$

素因数の和:548

約数の個数: 48

約数和(自身を含む): 46569600

約数和(自身を除く): 25330780

約数列:

[1, 2, 4, 5, 10, 20, 41, 59, 82, 118, 164, 205, 236, 295, 410, 439, 590, 820, 878, 1180, 1756, 2195, 2419, 4390, 4838, 8780, 9676, 12095, 17999, 24190, 25901, 35998, 48380, 51802, 71996, 89995, 103604, 129505, 179990, 259010, 359980, 518020, 1061941, 2123882, 4247764, 5309705, 10619410, 21238820]

約数ペア:

[(1, 21238820), (2, 10619410), (4, 5309705), (5, 4247764), (10, 2123882), (20, 1061941), (41, 518020), (59, 359980), (82, 259010), (118, 179990), (164, 129505), (205, 103604), (236, 89995), (295, 71996), (410, 51802), (439, 48380), (590, 35998), (820, 25901), (878, 24190), (1180, 17999), (1756, 12095), (2195, 9676), (2419, 8780), (4390, 4838)]