21125840

素因数分解:

$2^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{1327}}^1$

素因数の和:1539

約数の個数: 40

約数和(自身を含む): 49401600

約数和(自身を除く): 28275760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199, 398, 796, 995, 1327, 1592, 1990, 2654, 3184, 3980, 5308, 6635, 7960, 10616, 13270, 15920, 21232, 26540, 53080, 106160, 264073, 528146, 1056292, 1320365, 2112584, 2640730, 4225168, 5281460, 10562920, 21125840]

約数ペア:

[(1, 21125840), (2, 10562920), (4, 5281460), (5, 4225168), (8, 2640730), (10, 2112584), (16, 1320365), (20, 1056292), (40, 528146), (80, 264073), (199, 106160), (398, 53080), (796, 26540), (995, 21232), (1327, 15920), (1592, 13270), (1990, 10616), (2654, 7960), (3184, 6635), (3980, 5308)]