21137920

素因数分解:

$2^9\times 5^1\times {\mathrm{23}}^1\times {\mathrm{359}}^1$

素因数の和:405

約数の個数: 80

約数和(自身を含む): 53032320

約数和(自身を除く): 31894400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 32, 40, 46, 64, 80, 92, 115, 128, 160, 184, 230, 256, 320, 359, 368, 460, 512, 640, 718, 736, 920, 1280, 1436, 1472, 1795, 1840, 2560, 2872, 2944, 3590, 3680, 5744, 5888, 7180, 7360, 8257, 11488, 11776, 14360, 14720, 16514, 22976, 28720, 29440, 33028, 41285, 45952, 57440, 58880, 66056, 82570, 91904, 114880, 132112, 165140, 183808, 229760, 264224, 330280, 459520, 528448, 660560, 919040, 1056896, 1321120, 2113792, 2642240, 4227584, 5284480, 10568960, 21137920]

約数ペア:

[(1, 21137920), (2, 10568960), (4, 5284480), (5, 4227584), (8, 2642240), (10, 2113792), (16, 1321120), (20, 1056896), (23, 919040), (32, 660560), (40, 528448), (46, 459520), (64, 330280), (80, 264224), (92, 229760), (115, 183808), (128, 165140), (160, 132112), (184, 114880), (230, 91904), (256, 82570), (320, 66056), (359, 58880), (368, 57440), (460, 45952), (512, 41285), (640, 33028), (718, 29440), (736, 28720), (920, 22976), (1280, 16514), (1436, 14720), (1472, 14360), (1795, 11776), (1840, 11488), (2560, 8257), (2872, 7360), (2944, 7180), (3590, 5888), (3680, 5744)]