21285720

素因数分解:

$2^3\times 3^3\times 5^1\times {\mathrm{19709}}^1$

素因数の和:19729

約数の個数: 64

約数和(自身を含む): 70956000

約数和(自身を除く): 49670280

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 27, 30, 36, 40, 45, 54, 60, 72, 90, 108, 120, 135, 180, 216, 270, 360, 540, 1080, 19709, 39418, 59127, 78836, 98545, 118254, 157672, 177381, 197090, 236508, 295635, 354762, 394180, 473016, 532143, 591270, 709524, 788360, 886905, 1064286, 1182540, 1419048, 1773810, 2128572, 2365080, 2660715, 3547620, 4257144, 5321430, 7095240, 10642860, 21285720]

約数ペア:

[(1, 21285720), (2, 10642860), (3, 7095240), (4, 5321430), (5, 4257144), (6, 3547620), (8, 2660715), (9, 2365080), (10, 2128572), (12, 1773810), (15, 1419048), (18, 1182540), (20, 1064286), (24, 886905), (27, 788360), (30, 709524), (36, 591270), (40, 532143), (45, 473016), (54, 394180), (60, 354762), (72, 295635), (90, 236508), (108, 197090), (120, 177381), (135, 157672), (180, 118254), (216, 98545), (270, 78836), (360, 59127), (540, 39418), (1080, 19709)]