19980245

素因数分解:

$5^1\times {\mathrm{61}}^1\times {\mathrm{109}}^1\times {\mathrm{601}}^1$

素因数の和:776

約数の個数: 16

約数和(自身を含む): 24633840

約数和(自身を除く): 4653595

約数列:

[1, 5, 61, 109, 305, 545, 601, 3005, 6649, 33245, 36661, 65509, 183305, 327545, 3996049, 19980245]

約数ペア:

[(1, 19980245), (5, 3996049), (61, 327545), (109, 183305), (305, 65509), (545, 36661), (601, 33245), (3005, 6649)]