21789117

素因数分解:

$3^2\times 7^1\times {\mathrm{349}}^1\times {\mathrm{991}}^1$

素因数の和:1353

約数の個数: 24

約数和(自身を含む): 36108800

約数和(自身を除く): 14319683

約数列:

[1, 3, 7, 9, 21, 63, 349, 991, 1047, 2443, 2973, 3141, 6937, 7329, 8919, 20811, 21987, 62433, 345859, 1037577, 2421013, 3112731, 7263039, 21789117]

約数ペア:

[(1, 21789117), (3, 7263039), (7, 3112731), (9, 2421013), (21, 1037577), (63, 345859), (349, 62433), (991, 21987), (1047, 20811), (2443, 8919), (2973, 7329), (3141, 6937)]