21431305

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{181}}^1\times {\mathrm{199}}^1$

素因数の和:409

約数の個数: 32

約数和(自身を含む): 31449600

約数和(自身を除く): 10018295

約数列:

[1, 5, 7, 17, 35, 85, 119, 181, 199, 595, 905, 995, 1267, 1393, 3077, 3383, 6335, 6965, 15385, 16915, 21539, 23681, 36019, 107695, 118405, 180095, 252133, 612323, 1260665, 3061615, 4286261, 21431305]

約数ペア:

[(1, 21431305), (5, 4286261), (7, 3061615), (17, 1260665), (35, 612323), (85, 252133), (119, 180095), (181, 118405), (199, 107695), (595, 36019), (905, 23681), (995, 21539), (1267, 16915), (1393, 15385), (3077, 6965), (3383, 6335)]