20578285

素因数分解:

$5^1\times 7^3\times {\mathrm{13}}^2\times {\mathrm{71}}^1$

素因数の和:123

約数の個数: 48

約数和(自身を含む): 31622400

約数和(自身を除く): 11044115

約数列:

[1, 5, 7, 13, 35, 49, 65, 71, 91, 169, 245, 343, 355, 455, 497, 637, 845, 923, 1183, 1715, 2485, 3185, 3479, 4459, 4615, 5915, 6461, 8281, 11999, 17395, 22295, 24353, 32305, 41405, 45227, 57967, 59995, 83993, 121765, 226135, 289835, 316589, 419965, 587951, 1582945, 2939755, 4115657, 20578285]

約数ペア:

[(1, 20578285), (5, 4115657), (7, 2939755), (13, 1582945), (35, 587951), (49, 419965), (65, 316589), (71, 289835), (91, 226135), (169, 121765), (245, 83993), (343, 59995), (355, 57967), (455, 45227), (497, 41405), (637, 32305), (845, 24353), (923, 22295), (1183, 17395), (1715, 11999), (2485, 8281), (3185, 6461), (3479, 5915), (4459, 4615)]