20805040

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6343}}^1$

素因数の和:6397

約数の個数: 40

約数和(自身を含む): 49559328

約数和(自身を除く): 28754288

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6343, 12686, 25372, 31715, 50744, 63430, 101488, 126860, 253720, 260063, 507440, 520126, 1040252, 1300315, 2080504, 2600630, 4161008, 5201260, 10402520, 20805040]

約数ペア:

[(1, 20805040), (2, 10402520), (4, 5201260), (5, 4161008), (8, 2600630), (10, 2080504), (16, 1300315), (20, 1040252), (40, 520126), (41, 507440), (80, 260063), (82, 253720), (164, 126860), (205, 101488), (328, 63430), (410, 50744), (656, 31715), (820, 25372), (1640, 12686), (3280, 6343)]