21407815

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{379}}^1$

素因数の和:487

約数の個数: 32

約数和(自身を含む): 30643200

約数和(自身を除く): 9235385

約数列:

[1, 5, 11, 13, 55, 65, 79, 143, 379, 395, 715, 869, 1027, 1895, 4169, 4345, 4927, 5135, 11297, 20845, 24635, 29941, 54197, 56485, 149705, 270985, 329351, 389233, 1646755, 1946165, 4281563, 21407815]

約数ペア:

[(1, 21407815), (5, 4281563), (11, 1946165), (13, 1646755), (55, 389233), (65, 329351), (79, 270985), (143, 149705), (379, 56485), (395, 54197), (715, 29941), (869, 24635), (1027, 20845), (1895, 11297), (4169, 5135), (4345, 4927)]