21009915

素因数分解:

$3^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{8191}}^1$

素因数の和:8224

約数の個数: 32

約数和(自身を含む): 39321600

約数和(自身を除く): 18311685

約数列:

[1, 3, 5, 9, 15, 19, 27, 45, 57, 95, 135, 171, 285, 513, 855, 2565, 8191, 24573, 40955, 73719, 122865, 155629, 221157, 368595, 466887, 778145, 1105785, 1400661, 2334435, 4201983, 7003305, 21009915]

約数ペア:

[(1, 21009915), (3, 7003305), (5, 4201983), (9, 2334435), (15, 1400661), (19, 1105785), (27, 778145), (45, 466887), (57, 368595), (95, 221157), (135, 155629), (171, 122865), (285, 73719), (513, 40955), (855, 24573), (2565, 8191)]