639968

素因数分解:

$2^5\times 7^1\times {\mathrm{2857}}^1$

素因数の和:2874

約数の個数: 24

約数和(自身を含む): 1440432

約数和(自身を除く): 800464

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 32, 56, 112, 224, 2857, 5714, 11428, 19999, 22856, 39998, 45712, 79996, 91424, 159992, 319984, 639968]

約数ペア:

[(1, 639968), (2, 319984), (4, 159992), (7, 91424), (8, 79996), (14, 45712), (16, 39998), (28, 22856), (32, 19999), (56, 11428), (112, 5714), (224, 2857)]