21288015

素因数分解:

$3^5\times 5^1\times 7^1\times {\mathrm{2503}}^1$

素因数の和:2530

約数の個数: 48

約数和(自身を含む): 43749888

約数和(自身を除く): 22461873

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 81, 105, 135, 189, 243, 315, 405, 567, 945, 1215, 1701, 2503, 2835, 7509, 8505, 12515, 17521, 22527, 37545, 52563, 67581, 87605, 112635, 157689, 202743, 262815, 337905, 473067, 608229, 788445, 1013715, 1419201, 2365335, 3041145, 4257603, 7096005, 21288015]

約数ペア:

[(1, 21288015), (3, 7096005), (5, 4257603), (7, 3041145), (9, 2365335), (15, 1419201), (21, 1013715), (27, 788445), (35, 608229), (45, 473067), (63, 337905), (81, 262815), (105, 202743), (135, 157689), (189, 112635), (243, 87605), (315, 67581), (405, 52563), (567, 37545), (945, 22527), (1215, 17521), (1701, 12515), (2503, 8505), (2835, 7509)]