21058960

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20249}}^1$

素因数の和:20275

約数の個数: 40

約数和(自身を含む): 52731000

約数和(自身を除く): 31672040

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20249, 40498, 80996, 101245, 161992, 202490, 263237, 323984, 404980, 526474, 809960, 1052948, 1316185, 1619920, 2105896, 2632370, 4211792, 5264740, 10529480, 21058960]

約数ペア:

[(1, 21058960), (2, 10529480), (4, 5264740), (5, 4211792), (8, 2632370), (10, 2105896), (13, 1619920), (16, 1316185), (20, 1052948), (26, 809960), (40, 526474), (52, 404980), (65, 323984), (80, 263237), (104, 202490), (130, 161992), (208, 101245), (260, 80996), (520, 40498), (1040, 20249)]