21940191

素因数分解:

$3^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1$

素因数の和:165

約数の個数: 72

約数和(自身を含む): 41081040

約数和(自身を除く): 19140849

約数列:

[1, 3, 7, 9, 13, 21, 39, 43, 49, 63, 89, 91, 117, 129, 147, 267, 273, 301, 387, 441, 559, 623, 637, 801, 819, 903, 1157, 1677, 1869, 1911, 2107, 2709, 3471, 3827, 3913, 4361, 5031, 5607, 5733, 6321, 8099, 10413, 11481, 11739, 13083, 18963, 24297, 26789, 27391, 34443, 35217, 39249, 49751, 56693, 72891, 80367, 82173, 149253, 170079, 187523, 241101, 246519, 348257, 447759, 510237, 562569, 1044771, 1687707, 2437799, 3134313, 7313397, 21940191]

約数ペア:

[(1, 21940191), (3, 7313397), (7, 3134313), (9, 2437799), (13, 1687707), (21, 1044771), (39, 562569), (43, 510237), (49, 447759), (63, 348257), (89, 246519), (91, 241101), (117, 187523), (129, 170079), (147, 149253), (267, 82173), (273, 80367), (301, 72891), (387, 56693), (441, 49751), (559, 39249), (623, 35217), (637, 34443), (801, 27391), (819, 26789), (903, 24297), (1157, 18963), (1677, 13083), (1869, 11739), (1911, 11481), (2107, 10413), (2709, 8099), (3471, 6321), (3827, 5733), (3913, 5607), (4361, 5031)]