20969721

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{59}}^1\times {\mathrm{101}}^1$

素因数の和:206

約数の個数: 48

約数和(自身を含む): 34369920

約数和(自身を除く): 13400199

約数列:

[1, 3, 9, 17, 23, 51, 59, 69, 101, 153, 177, 207, 303, 391, 531, 909, 1003, 1173, 1357, 1717, 2323, 3009, 3519, 4071, 5151, 5959, 6969, 9027, 12213, 15453, 17877, 20907, 23069, 39491, 53631, 69207, 101303, 118473, 137057, 207621, 303909, 355419, 411171, 911727, 1233513, 2329969, 6989907, 20969721]

約数ペア:

[(1, 20969721), (3, 6989907), (9, 2329969), (17, 1233513), (23, 911727), (51, 411171), (59, 355419), (69, 303909), (101, 207621), (153, 137057), (177, 118473), (207, 101303), (303, 69207), (391, 53631), (531, 39491), (909, 23069), (1003, 20907), (1173, 17877), (1357, 15453), (1717, 12213), (2323, 9027), (3009, 6969), (3519, 5959), (4071, 5151)]