21156585

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{163}}^1\times {\mathrm{509}}^1$

素因数の和:697

約数の個数: 32

約数和(自身を含む): 36132480

約数和(自身を除く): 14975895

約数列:

[1, 3, 5, 15, 17, 51, 85, 163, 255, 489, 509, 815, 1527, 2445, 2545, 2771, 7635, 8313, 8653, 13855, 25959, 41565, 43265, 82967, 129795, 248901, 414835, 1244505, 1410439, 4231317, 7052195, 21156585]

約数ペア:

[(1, 21156585), (3, 7052195), (5, 4231317), (15, 1410439), (17, 1244505), (51, 414835), (85, 248901), (163, 129795), (255, 82967), (489, 43265), (509, 41565), (815, 25959), (1527, 13855), (2445, 8653), (2545, 8313), (2771, 7635)]