19888895

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{439}}^1$

素因数の和:515

約数の個数: 32

約数和(自身を含む): 27941760

約数和(自身を除く): 8052865

約数列:

[1, 5, 13, 17, 41, 65, 85, 205, 221, 439, 533, 697, 1105, 2195, 2665, 3485, 5707, 7463, 9061, 17999, 28535, 37315, 45305, 89995, 97019, 233987, 305983, 485095, 1169935, 1529915, 3977779, 19888895]

約数ペア:

[(1, 19888895), (5, 3977779), (13, 1529915), (17, 1169935), (41, 485095), (65, 305983), (85, 233987), (205, 97019), (221, 89995), (439, 45305), (533, 37315), (697, 28535), (1105, 17999), (2195, 9061), (2665, 7463), (3485, 5707)]