21000084

素因数分解:

$2^2\times 3^1\times 7^1\times {\mathrm{53}}^2\times {\mathrm{89}}^1$

素因数の和:209

約数の個数: 72

約数和(自身を含む): 57718080

約数和(自身を除く): 36717996

約数列:

[1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 53, 84, 89, 106, 159, 178, 212, 267, 318, 356, 371, 534, 623, 636, 742, 1068, 1113, 1246, 1484, 1869, 2226, 2492, 2809, 3738, 4452, 4717, 5618, 7476, 8427, 9434, 11236, 14151, 16854, 18868, 19663, 28302, 33019, 33708, 39326, 56604, 58989, 66038, 78652, 99057, 117978, 132076, 198114, 235956, 250001, 396228, 500002, 750003, 1000004, 1500006, 1750007, 3000012, 3500014, 5250021, 7000028, 10500042, 21000084]

約数ペア:

[(1, 21000084), (2, 10500042), (3, 7000028), (4, 5250021), (6, 3500014), (7, 3000012), (12, 1750007), (14, 1500006), (21, 1000004), (28, 750003), (42, 500002), (53, 396228), (84, 250001), (89, 235956), (106, 198114), (159, 132076), (178, 117978), (212, 99057), (267, 78652), (318, 66038), (356, 58989), (371, 56604), (534, 39326), (623, 33708), (636, 33019), (742, 28302), (1068, 19663), (1113, 18868), (1246, 16854), (1484, 14151), (1869, 11236), (2226, 9434), (2492, 8427), (2809, 7476), (3738, 5618), (4452, 4717)]