128819720

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{15263}}^1$

素因数の和:15485

約数の個数: 32

約数和(自身を含む): 291237120

約数和(自身を除く): 162417400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 4220, 8440, 15263, 30526, 61052, 76315, 122104, 152630, 305260, 610520, 3220493, 6440986, 12881972, 16102465, 25763944, 32204930, 64409860, 128819720]

約数ペア:

[(1, 128819720), (2, 64409860), (4, 32204930), (5, 25763944), (8, 16102465), (10, 12881972), (20, 6440986), (40, 3220493), (211, 610520), (422, 305260), (844, 152630), (1055, 122104), (1688, 76315), (2110, 61052), (4220, 30526), (8440, 15263)]