21285080

素因数分解:

$2^3\times 5^1\times {\mathrm{401}}^1\times {\mathrm{1327}}^1$

素因数の和:1739

約数の個数: 32

約数和(自身を含む): 48047040

約数和(自身を除く): 26761960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 401, 802, 1327, 1604, 2005, 2654, 3208, 4010, 5308, 6635, 8020, 10616, 13270, 16040, 26540, 53080, 532127, 1064254, 2128508, 2660635, 4257016, 5321270, 10642540, 21285080]

約数ペア:

[(1, 21285080), (2, 10642540), (4, 5321270), (5, 4257016), (8, 2660635), (10, 2128508), (20, 1064254), (40, 532127), (401, 53080), (802, 26540), (1327, 16040), (1604, 13270), (2005, 10616), (2654, 8020), (3208, 6635), (4010, 5308)]