21508240

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20681}}^1$

素因数の和:20707

約数の個数: 40

約数和(自身を含む): 53855928

約数和(自身を除く): 32347688

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20681, 41362, 82724, 103405, 165448, 206810, 268853, 330896, 413620, 537706, 827240, 1075412, 1344265, 1654480, 2150824, 2688530, 4301648, 5377060, 10754120, 21508240]

約数ペア:

[(1, 21508240), (2, 10754120), (4, 5377060), (5, 4301648), (8, 2688530), (10, 2150824), (13, 1654480), (16, 1344265), (20, 1075412), (26, 827240), (40, 537706), (52, 413620), (65, 330896), (80, 268853), (104, 206810), (130, 165448), (208, 103405), (260, 82724), (520, 41362), (1040, 20681)]