21989891

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{107}}^1\times {\mathrm{157}}^1$

素因数の和:299

約数の個数: 32

約数和(自身を含む): 29486592

約数和(自身を除く): 7496701

約数列:

[1, 7, 11, 17, 77, 107, 119, 157, 187, 749, 1099, 1177, 1309, 1727, 1819, 2669, 8239, 12089, 12733, 16799, 18683, 20009, 29359, 117593, 140063, 184789, 205513, 285583, 1293523, 1999081, 3141413, 21989891]

約数ペア:

[(1, 21989891), (7, 3141413), (11, 1999081), (17, 1293523), (77, 285583), (107, 205513), (119, 184789), (157, 140063), (187, 117593), (749, 29359), (1099, 20009), (1177, 18683), (1309, 16799), (1727, 12733), (1819, 12089), (2669, 8239)]