21640070

素因数分解:

$2^1\times 5^1\times {\mathrm{389}}^1\times {\mathrm{5563}}^1$

素因数の和:5959

約数の個数: 16

約数和(自身を含む): 39059280

約数和(自身を除く): 17419210

約数列:

[1, 2, 5, 10, 389, 778, 1945, 3890, 5563, 11126, 27815, 55630, 2164007, 4328014, 10820035, 21640070]

約数ペア:

[(1, 21640070), (2, 10820035), (5, 4328014), (10, 2164007), (389, 55630), (778, 27815), (1945, 11126), (3890, 5563)]