21688515

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{28351}}^1$

素因数の和:28379

約数の個数: 24

約数和(自身を含む): 39806208

約数和(自身を除く): 18117693

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765, 28351, 85053, 141755, 255159, 425265, 481967, 1275795, 1445901, 2409835, 4337703, 7229505, 21688515]

約数ペア:

[(1, 21688515), (3, 7229505), (5, 4337703), (9, 2409835), (15, 1445901), (17, 1275795), (45, 481967), (51, 425265), (85, 255159), (153, 141755), (255, 85053), (765, 28351)]