21109816

素因数分解:

$2^3\times 7^1\times {\mathrm{13}}^1\times {\mathrm{107}}^1\times {\mathrm{271}}^1$

素因数の和:404

約数の個数: 64

約数和(自身を含む): 49351680

約数和(自身を除く): 28241864

約数列:

[1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56, 91, 104, 107, 182, 214, 271, 364, 428, 542, 728, 749, 856, 1084, 1391, 1498, 1897, 2168, 2782, 2996, 3523, 3794, 5564, 5992, 7046, 7588, 9737, 11128, 14092, 15176, 19474, 24661, 28184, 28997, 38948, 49322, 57994, 77896, 98644, 115988, 197288, 202979, 231976, 376961, 405958, 753922, 811916, 1507844, 1623832, 2638727, 3015688, 5277454, 10554908, 21109816]

約数ペア:

[(1, 21109816), (2, 10554908), (4, 5277454), (7, 3015688), (8, 2638727), (13, 1623832), (14, 1507844), (26, 811916), (28, 753922), (52, 405958), (56, 376961), (91, 231976), (104, 202979), (107, 197288), (182, 115988), (214, 98644), (271, 77896), (364, 57994), (428, 49322), (542, 38948), (728, 28997), (749, 28184), (856, 24661), (1084, 19474), (1391, 15176), (1498, 14092), (1897, 11128), (2168, 9737), (2782, 7588), (2996, 7046), (3523, 5992), (3794, 5564)]