81780020

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{83449}}^1$

素因数の和:83472

約数の個数: 36

約数和(自身を含む): 199779300

約数和(自身を除く): 117999280

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 980, 83449, 166898, 333796, 417245, 584143, 834490, 1168286, 1668980, 2336572, 2920715, 4089001, 5841430, 8178002, 11682860, 16356004, 20445005, 40890010, 81780020]

約数ペア:

[(1, 81780020), (2, 40890010), (4, 20445005), (5, 16356004), (7, 11682860), (10, 8178002), (14, 5841430), (20, 4089001), (28, 2920715), (35, 2336572), (49, 1668980), (70, 1168286), (98, 834490), (140, 584143), (196, 417245), (245, 333796), (490, 166898), (980, 83449)]