21571521

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{67}}^1\times {\mathrm{107}}^1$

素因数の和:253

約数の個数: 32

約数和(自身を含む): 31726080

約数和(自身を除く): 10154559

約数列:

[1, 3, 17, 51, 59, 67, 107, 177, 201, 321, 1003, 1139, 1819, 3009, 3417, 3953, 5457, 6313, 7169, 11859, 18939, 21507, 67201, 107321, 121873, 201603, 321963, 365619, 422971, 1268913, 7190507, 21571521]

約数ペア:

[(1, 21571521), (3, 7190507), (17, 1268913), (51, 422971), (59, 365619), (67, 321963), (107, 201603), (177, 121873), (201, 107321), (321, 67201), (1003, 21507), (1139, 18939), (1819, 11859), (3009, 7169), (3417, 6313), (3953, 5457)]