21109732

素因数分解:

$2^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{197}}^1$

素因数の和:340

約数の個数: 48

約数和(自身を含む): 43908480

約数和(自身を除く): 22798748

約数列:

[1, 2, 4, 7, 14, 28, 43, 86, 89, 172, 178, 197, 301, 356, 394, 602, 623, 788, 1204, 1246, 1379, 2492, 2758, 3827, 5516, 7654, 8471, 15308, 16942, 17533, 26789, 33884, 35066, 53578, 59297, 70132, 107156, 118594, 122731, 237188, 245462, 490924, 753919, 1507838, 3015676, 5277433, 10554866, 21109732]

約数ペア:

[(1, 21109732), (2, 10554866), (4, 5277433), (7, 3015676), (14, 1507838), (28, 753919), (43, 490924), (86, 245462), (89, 237188), (172, 122731), (178, 118594), (197, 107156), (301, 70132), (356, 59297), (394, 53578), (602, 35066), (623, 33884), (788, 26789), (1204, 17533), (1246, 16942), (1379, 15308), (2492, 8471), (2758, 7654), (3827, 5516)]