21259960

素因数分解:

$2^3\times 5^1\times {\mathrm{311}}^1\times {\mathrm{1709}}^1$

素因数の和:2031

約数の個数: 32

約数和(自身を含む): 48016800

約数和(自身を除く): 26756840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 311, 622, 1244, 1555, 1709, 2488, 3110, 3418, 6220, 6836, 8545, 12440, 13672, 17090, 34180, 68360, 531499, 1062998, 2125996, 2657495, 4251992, 5314990, 10629980, 21259960]

約数ペア:

[(1, 21259960), (2, 10629980), (4, 5314990), (5, 4251992), (8, 2657495), (10, 2125996), (20, 1062998), (40, 531499), (311, 68360), (622, 34180), (1244, 17090), (1555, 13672), (1709, 12440), (2488, 8545), (3110, 6836), (3418, 6220)]