28409980

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{17981}}^1$

素因数の和:18069

約数の個数: 24

約数和(自身を含む): 60419520

約数和(自身を除く): 32009540

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 17981, 35962, 71924, 89905, 179810, 359620, 1420499, 2840998, 5681996, 7102495, 14204990, 28409980]

約数ペア:

[(1, 28409980), (2, 14204990), (4, 7102495), (5, 5681996), (10, 2840998), (20, 1420499), (79, 359620), (158, 179810), (316, 89905), (395, 71924), (790, 35962), (1580, 17981)]