19901985

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^2\times {\mathrm{4591}}^1$

素因数の和:4633

約数の個数: 24

約数和(自身を含む): 33833856

約数和(自身を除く): 13931871

約数列:

[1, 3, 5, 15, 17, 51, 85, 255, 289, 867, 1445, 4335, 4591, 13773, 22955, 68865, 78047, 234141, 390235, 1170705, 1326799, 3980397, 6633995, 19901985]

約数ペア:

[(1, 19901985), (3, 6633995), (5, 3980397), (15, 1326799), (17, 1170705), (51, 390235), (85, 234141), (255, 78047), (289, 68865), (867, 22955), (1445, 13773), (4335, 4591)]