20198780

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{20611}}^1$

素因数の和:20634

約数の個数: 36

約数和(自身を含む): 49345128

約数和(自身を除く): 29146348

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 20611, 41222, 82444, 103055, 144277, 206110, 288554, 412220, 577108, 721385, 1009939, 1442770, 2019878, 2885540, 4039756, 5049695, 10099390, 20198780]

約数ペア:

[(1, 20198780), (2, 10099390), (4, 5049695), (5, 4039756), (7, 2885540), (10, 2019878), (14, 1442770), (20, 1009939), (28, 721385), (35, 577108), (49, 412220), (70, 288554), (98, 206110), (140, 144277), (196, 103055), (245, 82444), (490, 41222), (980, 20611)]