19947921

素因数分解:

$3^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{25673}}^1$

素因数の和:25720

約数の個数: 16

約数和(自身を含む): 31219584

約数和(自身を除く): 11271663

約数列:

[1, 3, 7, 21, 37, 111, 259, 777, 25673, 77019, 179711, 539133, 949901, 2849703, 6649307, 19947921]

約数ペア:

[(1, 19947921), (3, 6649307), (7, 2849703), (21, 949901), (37, 539133), (111, 179711), (259, 77019), (777, 25673)]