400820

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{409}}^1$

素因数の和:432

約数の個数: 36

約数和(自身を含む): 981540

約数和(自身を除く): 580720

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 409, 490, 818, 980, 1636, 2045, 2863, 4090, 5726, 8180, 11452, 14315, 20041, 28630, 40082, 57260, 80164, 100205, 200410, 400820]

約数ペア:

[(1, 400820), (2, 200410), (4, 100205), (5, 80164), (7, 57260), (10, 40082), (14, 28630), (20, 20041), (28, 14315), (35, 11452), (49, 8180), (70, 5726), (98, 4090), (140, 2863), (196, 2045), (245, 1636), (409, 980), (490, 818)]