640804547980

素因数分解:

$2^2\times 5^1\times {\mathrm{647}}^1\times {\mathrm{49521217}}^1$

素因数の和:49521873

約数の個数: 24

約数和(自身を含む): 1347769469088

約数和(自身を除く): 706964921108

約数列:

[1, 2, 4, 5, 10, 20, 647, 1294, 2588, 3235, 6470, 12940, 49521217, 99042434, 198084868, 247606085, 495212170, 990424340, 32040227399, 64080454798, 128160909596, 160201136995, 320402273990, 640804547980]

約数ペア:

[(1, 640804547980), (2, 320402273990), (4, 160201136995), (5, 128160909596), (10, 64080454798), (20, 32040227399), (647, 990424340), (1294, 495212170), (2588, 247606085), (3235, 198084868), (6470, 99042434), (12940, 49521217)]