639843784

素因数分解:

$2^3\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{20899}}^1$

素因数の和:21037

約数の個数: 32

約数和(自身を含む): 1241460000

約数和(自身を除く): 601616216

約数列:

[1, 2, 4, 8, 43, 86, 89, 172, 178, 344, 356, 712, 3827, 7654, 15308, 20899, 30616, 41798, 83596, 167192, 898657, 1797314, 1860011, 3594628, 3720022, 7189256, 7440044, 14880088, 79980473, 159960946, 319921892, 639843784]

約数ペア:

[(1, 639843784), (2, 319921892), (4, 159960946), (8, 79980473), (43, 14880088), (86, 7440044), (89, 7189256), (172, 3720022), (178, 3594628), (344, 1860011), (356, 1797314), (712, 898657), (3827, 167192), (7654, 83596), (15308, 41798), (20899, 30616)]