21809020

素因数分解:

$2^2\times 5^1\times {\mathrm{257}}^1\times {\mathrm{4243}}^1$

素因数の和:4509

約数の個数: 24

約数和(自身を含む): 45987984

約数和(自身を除く): 24178964

約数列:

[1, 2, 4, 5, 10, 20, 257, 514, 1028, 1285, 2570, 4243, 5140, 8486, 16972, 21215, 42430, 84860, 1090451, 2180902, 4361804, 5452255, 10904510, 21809020]

約数ペア:

[(1, 21809020), (2, 10904510), (4, 5452255), (5, 4361804), (10, 2180902), (20, 1090451), (257, 84860), (514, 42430), (1028, 21215), (1285, 16972), (2570, 8486), (4243, 5140)]