20898215

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{7477}}^1$

素因数の和:7538

約数の個数: 16

約数和(自身を含む): 27638688

約数和(自身を除く): 6740473

約数列:

[1, 5, 13, 43, 65, 215, 559, 2795, 7477, 37385, 97201, 321511, 486005, 1607555, 4179643, 20898215]

約数ペア:

[(1, 20898215), (5, 4179643), (13, 1607555), (43, 486005), (65, 321511), (215, 97201), (559, 37385), (2795, 7477)]