639777640

素因数分解:

$2^3\times 5^1\times {\mathrm{67}}^1\times {\mathrm{238723}}^1$

素因数の和:238801

約数の個数: 32

約数和(自身を含む): 1460990880

約数和(自身を除く): 821213240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 67, 134, 268, 335, 536, 670, 1340, 2680, 238723, 477446, 954892, 1193615, 1909784, 2387230, 4774460, 9548920, 15994441, 31988882, 63977764, 79972205, 127955528, 159944410, 319888820, 639777640]

約数ペア:

[(1, 639777640), (2, 319888820), (4, 159944410), (5, 127955528), (8, 79972205), (10, 63977764), (20, 31988882), (40, 15994441), (67, 9548920), (134, 4774460), (268, 2387230), (335, 1909784), (536, 1193615), (670, 954892), (1340, 477446), (2680, 238723)]