21021201

素因数分解:

$3^5\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{157}}^1$

素因数の和:220

約数の個数: 48

約数和(自身を含む): 34507200

約数和(自身を除く): 13485999

約数列:

[1, 3, 9, 19, 27, 29, 57, 81, 87, 157, 171, 243, 261, 471, 513, 551, 783, 1413, 1539, 1653, 2349, 2983, 4239, 4553, 4617, 4959, 7047, 8949, 12717, 13659, 14877, 26847, 38151, 40977, 44631, 80541, 86507, 122931, 133893, 241623, 259521, 368793, 724869, 778563, 1106379, 2335689, 7007067, 21021201]

約数ペア:

[(1, 21021201), (3, 7007067), (9, 2335689), (19, 1106379), (27, 778563), (29, 724869), (57, 368793), (81, 259521), (87, 241623), (157, 133893), (171, 122931), (243, 86507), (261, 80541), (471, 44631), (513, 40977), (551, 38151), (783, 26847), (1413, 14877), (1539, 13659), (1653, 12717), (2349, 8949), (2983, 7047), (4239, 4959), (4553, 4617)]