21680680

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{77431}}^1$

素因数の和:77449

約数の個数: 32

約数和(自身を含む): 55751040

約数和(自身を除く): 34070360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 77431, 154862, 309724, 387155, 542017, 619448, 774310, 1084034, 1548620, 2168068, 2710085, 3097240, 4336136, 5420170, 10840340, 21680680]

約数ペア:

[(1, 21680680), (2, 10840340), (4, 5420170), (5, 4336136), (7, 3097240), (8, 2710085), (10, 2168068), (14, 1548620), (20, 1084034), (28, 774310), (35, 619448), (40, 542017), (56, 387155), (70, 309724), (140, 154862), (280, 77431)]