21489705

素因数分解:

$3^5\times 5^1\times {\mathrm{23}}^1\times {\mathrm{769}}^1$

素因数の和:812

約数の個数: 48

約数和(自身を含む): 40360320

約数和(自身を除く): 18870615

約数列:

[1, 3, 5, 9, 15, 23, 27, 45, 69, 81, 115, 135, 207, 243, 345, 405, 621, 769, 1035, 1215, 1863, 2307, 3105, 3845, 5589, 6921, 9315, 11535, 17687, 20763, 27945, 34605, 53061, 62289, 88435, 103815, 159183, 186867, 265305, 311445, 477549, 795915, 934335, 1432647, 2387745, 4297941, 7163235, 21489705]

約数ペア:

[(1, 21489705), (3, 7163235), (5, 4297941), (9, 2387745), (15, 1432647), (23, 934335), (27, 795915), (45, 477549), (69, 311445), (81, 265305), (115, 186867), (135, 159183), (207, 103815), (243, 88435), (345, 62289), (405, 53061), (621, 34605), (769, 27945), (1035, 20763), (1215, 17687), (1863, 11535), (2307, 9315), (3105, 6921), (3845, 5589)]