20521281

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{101}}^1\times {\mathrm{131}}^1$

素因数の和:293

約数の個数: 32

約数和(自身を含む): 31021056

約数和(自身を除く): 10499775

約数列:

[1, 3, 11, 33, 47, 101, 131, 141, 303, 393, 517, 1111, 1441, 1551, 3333, 4323, 4747, 6157, 13231, 14241, 18471, 39693, 52217, 67727, 145541, 156651, 203181, 436623, 621857, 1865571, 6840427, 20521281]

約数ペア:

[(1, 20521281), (3, 6840427), (11, 1865571), (33, 621857), (47, 436623), (101, 203181), (131, 156651), (141, 145541), (303, 67727), (393, 52217), (517, 39693), (1111, 18471), (1441, 14241), (1551, 13231), (3333, 6157), (4323, 4747)]