21290031

素因数分解:

$3^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{271}}^1$

素因数の和:356

約数の個数: 48

約数和(自身を含む): 37340160

約数和(自身を除く): 16050129

約数列:

[1, 3, 7, 9, 21, 29, 43, 63, 87, 129, 203, 261, 271, 301, 387, 609, 813, 903, 1247, 1827, 1897, 2439, 2709, 3741, 5691, 7859, 8729, 11223, 11653, 17073, 23577, 26187, 34959, 55013, 70731, 78561, 81571, 104877, 165039, 244713, 337937, 495117, 734139, 1013811, 2365559, 3041433, 7096677, 21290031]

約数ペア:

[(1, 21290031), (3, 7096677), (7, 3041433), (9, 2365559), (21, 1013811), (29, 734139), (43, 495117), (63, 337937), (87, 244713), (129, 165039), (203, 104877), (261, 81571), (271, 78561), (301, 70731), (387, 55013), (609, 34959), (813, 26187), (903, 23577), (1247, 17073), (1827, 11653), (1897, 11223), (2439, 8729), (2709, 7859), (3741, 5691)]