21241780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{2137}}^1$

素因数の和:2224

約数の個数: 48

約数和(自身を含む): 51722496

約数和(自身を除く): 30480716

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1988, 2137, 2485, 4274, 4970, 8548, 9940, 10685, 14959, 21370, 29918, 42740, 59836, 74795, 149590, 151727, 299180, 303454, 606908, 758635, 1062089, 1517270, 2124178, 3034540, 4248356, 5310445, 10620890, 21241780]

約数ペア:

[(1, 21241780), (2, 10620890), (4, 5310445), (5, 4248356), (7, 3034540), (10, 2124178), (14, 1517270), (20, 1062089), (28, 758635), (35, 606908), (70, 303454), (71, 299180), (140, 151727), (142, 149590), (284, 74795), (355, 59836), (497, 42740), (710, 29918), (994, 21370), (1420, 14959), (1988, 10685), (2137, 9940), (2485, 8548), (4274, 4970)]