639376

素因数分解:

$2^4\times {\mathrm{89}}^1\times {\mathrm{449}}^1$

素因数の和:546

約数の個数: 20

約数和(自身を含む): 1255500

約数和(自身を除く): 616124

約数列:

[1, 2, 4, 8, 16, 89, 178, 356, 449, 712, 898, 1424, 1796, 3592, 7184, 39961, 79922, 159844, 319688, 639376]

約数ペア:

[(1, 639376), (2, 319688), (4, 159844), (8, 79922), (16, 39961), (89, 7184), (178, 3592), (356, 1796), (449, 1424), (712, 898)]