20627440

素因数分解:

$2^4\times 5^1\times {\mathrm{401}}^1\times {\mathrm{643}}^1$

素因数の和:1057

約数の個数: 40

約数和(自身を含む): 48153168

約数和(自身を除く): 27525728

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 401, 643, 802, 1286, 1604, 2005, 2572, 3208, 3215, 4010, 5144, 6416, 6430, 8020, 10288, 12860, 16040, 25720, 32080, 51440, 257843, 515686, 1031372, 1289215, 2062744, 2578430, 4125488, 5156860, 10313720, 20627440]

約数ペア:

[(1, 20627440), (2, 10313720), (4, 5156860), (5, 4125488), (8, 2578430), (10, 2062744), (16, 1289215), (20, 1031372), (40, 515686), (80, 257843), (401, 51440), (643, 32080), (802, 25720), (1286, 16040), (1604, 12860), (2005, 10288), (2572, 8020), (3208, 6430), (3215, 6416), (4010, 5144)]