21491990

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{5333}}^1$

素因数の和:5384

約数の個数: 32

約数和(自身を含む): 43013376

約数和(自身を除く): 21521386

約数列:

[1, 2, 5, 10, 13, 26, 31, 62, 65, 130, 155, 310, 403, 806, 2015, 4030, 5333, 10666, 26665, 53330, 69329, 138658, 165323, 330646, 346645, 693290, 826615, 1653230, 2149199, 4298398, 10745995, 21491990]

約数ペア:

[(1, 21491990), (2, 10745995), (5, 4298398), (10, 2149199), (13, 1653230), (26, 826615), (31, 693290), (62, 346645), (65, 330646), (130, 165323), (155, 138658), (310, 69329), (403, 53330), (806, 26665), (2015, 10666), (4030, 5333)]