21688005

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^2\times {\mathrm{5003}}^1$

素因数の和:5045

約数の個数: 24

約数和(自身を含む): 36869472

約数和(自身を除く): 15181467

約数列:

[1, 3, 5, 15, 17, 51, 85, 255, 289, 867, 1445, 4335, 5003, 15009, 25015, 75045, 85051, 255153, 425255, 1275765, 1445867, 4337601, 7229335, 21688005]

約数ペア:

[(1, 21688005), (3, 7229335), (5, 4337601), (15, 1445867), (17, 1275765), (51, 425255), (85, 255153), (255, 85051), (289, 75045), (867, 25015), (1445, 15009), (4335, 5003)]