20177678440

素因数分解:

$2^3\times 5^1\times {\mathrm{647}}^1\times {\mathrm{779663}}^1$

素因数の和:780321

約数の個数: 32

約数和(自身を含む): 45470004480

約数和(自身を除く): 25292326040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 647, 1294, 2588, 3235, 5176, 6470, 12940, 25880, 779663, 1559326, 3118652, 3898315, 6237304, 7796630, 15593260, 31186520, 504441961, 1008883922, 2017767844, 2522209805, 4035535688, 5044419610, 10088839220, 20177678440]

約数ペア:

[(1, 20177678440), (2, 10088839220), (4, 5044419610), (5, 4035535688), (8, 2522209805), (10, 2017767844), (20, 1008883922), (40, 504441961), (647, 31186520), (1294, 15593260), (2588, 7796630), (3235, 6237304), (5176, 3898315), (6470, 3118652), (12940, 1559326), (25880, 779663)]