21287090

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{431}}^1\times {\mathrm{449}}^1$

素因数の和:898

約数の個数: 32

約数和(自身を含む): 41990400

約数和(自身を除く): 20703310

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 431, 449, 862, 898, 2155, 2245, 4310, 4490, 4741, 4939, 9482, 9878, 23705, 24695, 47410, 49390, 193519, 387038, 967595, 1935190, 2128709, 4257418, 10643545, 21287090]

約数ペア:

[(1, 21287090), (2, 10643545), (5, 4257418), (10, 2128709), (11, 1935190), (22, 967595), (55, 387038), (110, 193519), (431, 49390), (449, 47410), (862, 24695), (898, 23705), (2155, 9878), (2245, 9482), (4310, 4939), (4490, 4741)]