20981681

素因数分解:

$7^1\times {\mathrm{19}}^4\times {\mathrm{23}}^1$

素因数の和:106

約数の個数: 20

約数和(自身を含む): 26411712

約数和(自身を除く): 5430031

約数列:

[1, 7, 19, 23, 133, 161, 361, 437, 2527, 3059, 6859, 8303, 48013, 58121, 130321, 157757, 912247, 1104299, 2997383, 20981681]

約数ペア:

[(1, 20981681), (7, 2997383), (19, 1104299), (23, 912247), (133, 157757), (161, 130321), (361, 58121), (437, 48013), (2527, 8303), (3059, 6859)]