19912240

素因数分解:

$2^4\times 5^1\times {\mathrm{248903}}^1$

素因数の和:248916

約数の個数: 20

約数和(自身を含む): 46296144

約数和(自身を除く): 26383904

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248903, 497806, 995612, 1244515, 1991224, 2489030, 3982448, 4978060, 9956120, 19912240]

約数ペア:

[(1, 19912240), (2, 9956120), (4, 4978060), (5, 3982448), (8, 2489030), (10, 1991224), (16, 1244515), (20, 995612), (40, 497806), (80, 248903)]