21381381

素因数分解:

$3^3\times 7^1\times {\mathrm{29}}^1\times {\mathrm{47}}^1\times {\mathrm{83}}^1$

素因数の和:175

約数の個数: 64

約数和(自身を含む): 38707200

約数和(自身を除く): 17325819

約数列:

[1, 3, 7, 9, 21, 27, 29, 47, 63, 83, 87, 141, 189, 203, 249, 261, 329, 423, 581, 609, 747, 783, 987, 1269, 1363, 1743, 1827, 2241, 2407, 2961, 3901, 4089, 5229, 5481, 7221, 8883, 9541, 11703, 12267, 15687, 16849, 21663, 27307, 28623, 35109, 36801, 50547, 64989, 81921, 85869, 105327, 113129, 151641, 245763, 257607, 339387, 454923, 737289, 791903, 1018161, 2375709, 3054483, 7127127, 21381381]

約数ペア:

[(1, 21381381), (3, 7127127), (7, 3054483), (9, 2375709), (21, 1018161), (27, 791903), (29, 737289), (47, 454923), (63, 339387), (83, 257607), (87, 245763), (141, 151641), (189, 113129), (203, 105327), (249, 85869), (261, 81921), (329, 64989), (423, 50547), (581, 36801), (609, 35109), (747, 28623), (783, 27307), (987, 21663), (1269, 16849), (1363, 15687), (1743, 12267), (1827, 11703), (2241, 9541), (2407, 8883), (2961, 7221), (3901, 5481), (4089, 5229)]