21145980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{197}}^1\times {\mathrm{1789}}^1$

素因数の和:1998

約数の個数: 48

約数和(自身を含む): 59542560

約数和(自身を除く): 38396580

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 197, 394, 591, 788, 985, 1182, 1789, 1970, 2364, 2955, 3578, 3940, 5367, 5910, 7156, 8945, 10734, 11820, 17890, 21468, 26835, 35780, 53670, 107340, 352433, 704866, 1057299, 1409732, 1762165, 2114598, 3524330, 4229196, 5286495, 7048660, 10572990, 21145980]

約数ペア:

[(1, 21145980), (2, 10572990), (3, 7048660), (4, 5286495), (5, 4229196), (6, 3524330), (10, 2114598), (12, 1762165), (15, 1409732), (20, 1057299), (30, 704866), (60, 352433), (197, 107340), (394, 53670), (591, 35780), (788, 26835), (985, 21468), (1182, 17890), (1789, 11820), (1970, 10734), (2364, 8945), (2955, 7156), (3578, 5910), (3940, 5367)]