21309915

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^2\times {\mathrm{59}}^1\times {\mathrm{199}}^1$

素因数の和:288

約数の個数: 48

約数和(自身を含む): 38304000

約数和(自身を除く): 16994085

約数列:

[1, 3, 5, 11, 15, 33, 55, 59, 121, 165, 177, 199, 295, 363, 597, 605, 649, 885, 995, 1815, 1947, 2189, 2985, 3245, 6567, 7139, 9735, 10945, 11741, 21417, 24079, 32835, 35223, 35695, 58705, 72237, 107085, 120395, 129151, 176115, 361185, 387453, 645755, 1420661, 1937265, 4261983, 7103305, 21309915]

約数ペア:

[(1, 21309915), (3, 7103305), (5, 4261983), (11, 1937265), (15, 1420661), (33, 645755), (55, 387453), (59, 361185), (121, 176115), (165, 129151), (177, 120395), (199, 107085), (295, 72237), (363, 58705), (597, 35695), (605, 35223), (649, 32835), (885, 24079), (995, 21417), (1815, 11741), (1947, 10945), (2189, 9735), (2985, 7139), (3245, 6567)]