20864080

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6361}}^1$

素因数の和:6415

約数の個数: 40

約数和(自身を含む): 49699944

約数和(自身を除く): 28835864

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6361, 12722, 25444, 31805, 50888, 63610, 101776, 127220, 254440, 260801, 508880, 521602, 1043204, 1304005, 2086408, 2608010, 4172816, 5216020, 10432040, 20864080]

約数ペア:

[(1, 20864080), (2, 10432040), (4, 5216020), (5, 4172816), (8, 2608010), (10, 2086408), (16, 1304005), (20, 1043204), (40, 521602), (41, 508880), (80, 260801), (82, 254440), (164, 127220), (205, 101776), (328, 63610), (410, 50888), (656, 31805), (820, 25444), (1640, 12722), (3280, 6361)]