20997805

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{59}}^1\times {\mathrm{79}}^1$

素因数の和:213

約数の個数: 32

約数和(自身を含む): 27993600

約数和(自身を除く): 6995795

約数列:

[1, 5, 17, 53, 59, 79, 85, 265, 295, 395, 901, 1003, 1343, 3127, 4187, 4505, 4661, 5015, 6715, 15635, 20935, 23305, 53159, 71179, 79237, 247033, 265795, 355895, 396185, 1235165, 4199561, 20997805]

約数ペア:

[(1, 20997805), (5, 4199561), (17, 1235165), (53, 396185), (59, 355895), (79, 265795), (85, 247033), (265, 79237), (295, 71179), (395, 53159), (901, 23305), (1003, 20935), (1343, 15635), (3127, 6715), (4187, 5015), (4505, 4661)]