21291520

素因数分解:

$2^9\times 5^1\times {\mathrm{8317}}^1$

素因数の和:8340

約数の個数: 40

約数和(自身を含む): 51055884

約数和(自身を除く): 29764364

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1280, 2560, 8317, 16634, 33268, 41585, 66536, 83170, 133072, 166340, 266144, 332680, 532288, 665360, 1064576, 1330720, 2129152, 2661440, 4258304, 5322880, 10645760, 21291520]

約数ペア:

[(1, 21291520), (2, 10645760), (4, 5322880), (5, 4258304), (8, 2661440), (10, 2129152), (16, 1330720), (20, 1064576), (32, 665360), (40, 532288), (64, 332680), (80, 266144), (128, 166340), (160, 133072), (256, 83170), (320, 66536), (512, 41585), (640, 33268), (1280, 16634), (2560, 8317)]