19990984

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{211}}^1\times {\mathrm{911}}^1$

素因数の和:1141

約数の個数: 32

約数和(自身を含む): 40602240

約数和(自身を除く): 20611256

約数列:

[1, 2, 4, 8, 13, 26, 52, 104, 211, 422, 844, 911, 1688, 1822, 2743, 3644, 5486, 7288, 10972, 11843, 21944, 23686, 47372, 94744, 192221, 384442, 768884, 1537768, 2498873, 4997746, 9995492, 19990984]

約数ペア:

[(1, 19990984), (2, 9995492), (4, 4997746), (8, 2498873), (13, 1537768), (26, 768884), (52, 384442), (104, 192221), (211, 94744), (422, 47372), (844, 23686), (911, 21944), (1688, 11843), (1822, 10972), (2743, 7288), (3644, 5486)]