21105279

素因数分解:

$3^6\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{131}}^1$

素因数の和:179

約数の個数: 56

約数和(自身を含む): 36357552

約数和(自身を除く): 15252273

約数列:

[1, 3, 9, 13, 17, 27, 39, 51, 81, 117, 131, 153, 221, 243, 351, 393, 459, 663, 729, 1053, 1179, 1377, 1703, 1989, 2227, 3159, 3537, 4131, 5109, 5967, 6681, 9477, 10611, 12393, 15327, 17901, 20043, 28951, 31833, 45981, 53703, 60129, 86853, 95499, 137943, 161109, 180387, 260559, 413829, 541161, 781677, 1241487, 1623483, 2345031, 7035093, 21105279]

約数ペア:

[(1, 21105279), (3, 7035093), (9, 2345031), (13, 1623483), (17, 1241487), (27, 781677), (39, 541161), (51, 413829), (81, 260559), (117, 180387), (131, 161109), (153, 137943), (221, 95499), (243, 86853), (351, 60129), (393, 53703), (459, 45981), (663, 31833), (729, 28951), (1053, 20043), (1179, 17901), (1377, 15327), (1703, 12393), (1989, 10611), (2227, 9477), (3159, 6681), (3537, 5967), (4131, 5109)]