21520305

素因数分解:

$3^2\times 5^1\times {\mathrm{103}}^1\times {\mathrm{4643}}^1$

素因数の和:4757

約数の個数: 24

約数和(自身を含む): 37672128

約数和(自身を除く): 16151823

約数列:

[1, 3, 5, 9, 15, 45, 103, 309, 515, 927, 1545, 4635, 4643, 13929, 23215, 41787, 69645, 208935, 478229, 1434687, 2391145, 4304061, 7173435, 21520305]

約数ペア:

[(1, 21520305), (3, 7173435), (5, 4304061), (9, 2391145), (15, 1434687), (45, 478229), (103, 208935), (309, 69645), (515, 41787), (927, 23215), (1545, 13929), (4635, 4643)]