19917471

素因数分解:

$3^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{137}}^1$

素因数の和:220

約数の個数: 48

約数和(自身を含む): 33225984

約数和(自身を除く): 13308513

約数列:

[1, 3, 7, 21, 23, 43, 49, 69, 129, 137, 147, 161, 301, 411, 483, 903, 959, 989, 1127, 2107, 2877, 2967, 3151, 3381, 5891, 6321, 6713, 6923, 9453, 17673, 20139, 20769, 22057, 41237, 48461, 66171, 123711, 135493, 145383, 154399, 288659, 406479, 463197, 865977, 948451, 2845353, 6639157, 19917471]

約数ペア:

[(1, 19917471), (3, 6639157), (7, 2845353), (21, 948451), (23, 865977), (43, 463197), (49, 406479), (69, 288659), (129, 154399), (137, 145383), (147, 135493), (161, 123711), (301, 66171), (411, 48461), (483, 41237), (903, 22057), (959, 20769), (989, 20139), (1127, 17673), (2107, 9453), (2877, 6923), (2967, 6713), (3151, 6321), (3381, 5891)]