21605451

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{173}}^1\times {\mathrm{313}}^1$

素因数の和:515

約数の個数: 32

約数和(自身を含む): 34967040

約数和(自身を除く): 13361589

約数列:

[1, 3, 7, 19, 21, 57, 133, 173, 313, 399, 519, 939, 1211, 2191, 3287, 3633, 5947, 6573, 9861, 17841, 23009, 41629, 54149, 69027, 124887, 162447, 379043, 1028831, 1137129, 3086493, 7201817, 21605451]

約数ペア:

[(1, 21605451), (3, 7201817), (7, 3086493), (19, 1137129), (21, 1028831), (57, 379043), (133, 162447), (173, 124887), (313, 69027), (399, 54149), (519, 41629), (939, 23009), (1211, 17841), (2191, 9861), (3287, 6573), (3633, 5947)]