21358220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:195

約数の個数: 72

約数和(自身を含む): 49805280

約数和(自身を除く): 28447060

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 71, 89, 130, 142, 169, 178, 260, 284, 338, 355, 356, 445, 676, 710, 845, 890, 923, 1157, 1420, 1690, 1780, 1846, 2314, 3380, 3692, 4615, 4628, 5785, 6319, 9230, 11570, 11999, 12638, 15041, 18460, 23140, 23998, 25276, 30082, 31595, 47996, 59995, 60164, 63190, 75205, 82147, 119990, 126380, 150410, 164294, 239980, 300820, 328588, 410735, 821470, 1067911, 1642940, 2135822, 4271644, 5339555, 10679110, 21358220]

約数ペア:

[(1, 21358220), (2, 10679110), (4, 5339555), (5, 4271644), (10, 2135822), (13, 1642940), (20, 1067911), (26, 821470), (52, 410735), (65, 328588), (71, 300820), (89, 239980), (130, 164294), (142, 150410), (169, 126380), (178, 119990), (260, 82147), (284, 75205), (338, 63190), (355, 60164), (356, 59995), (445, 47996), (676, 31595), (710, 30082), (845, 25276), (890, 23998), (923, 23140), (1157, 18460), (1420, 15041), (1690, 12638), (1780, 11999), (1846, 11570), (2314, 9230), (3380, 6319), (3692, 5785), (4615, 4628)]