21084520

素因数分解:

$2^3\times 5^1\times {\mathrm{431}}^1\times {\mathrm{1223}}^1$

素因数の和:1665

約数の個数: 32

約数和(自身を含む): 47589120

約数和(自身を除く): 26504600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 431, 862, 1223, 1724, 2155, 2446, 3448, 4310, 4892, 6115, 8620, 9784, 12230, 17240, 24460, 48920, 527113, 1054226, 2108452, 2635565, 4216904, 5271130, 10542260, 21084520]

約数ペア:

[(1, 21084520), (2, 10542260), (4, 5271130), (5, 4216904), (8, 2635565), (10, 2108452), (20, 1054226), (40, 527113), (431, 48920), (862, 24460), (1223, 17240), (1724, 12230), (2155, 9784), (2446, 8620), (3448, 6115), (4310, 4892)]