21013275

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{16481}}^1$

素因数の和:16511

約数の個数: 24

約数和(自身を含む): 36787824

約数和(自身を除く): 15774549

約数列:

[1, 3, 5, 15, 17, 25, 51, 75, 85, 255, 425, 1275, 16481, 49443, 82405, 247215, 280177, 412025, 840531, 1236075, 1400885, 4202655, 7004425, 21013275]

約数ペア:

[(1, 21013275), (3, 7004425), (5, 4202655), (15, 1400885), (17, 1236075), (25, 840531), (51, 412025), (75, 280177), (85, 247215), (255, 82405), (425, 49443), (1275, 16481)]