19917680

素因数分解:

$2^4\times 5^1\times {\mathrm{248971}}^1$

素因数の和:248984

約数の個数: 20

約数和(自身を含む): 46308792

約数和(自身を除く): 26391112

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248971, 497942, 995884, 1244855, 1991768, 2489710, 3983536, 4979420, 9958840, 19917680]

約数ペア:

[(1, 19917680), (2, 9958840), (4, 4979420), (5, 3983536), (8, 2489710), (10, 1991768), (16, 1244855), (20, 995884), (40, 497942), (80, 248971)]