21247120

素因数分解:

$2^4\times 5^1\times {\mathrm{349}}^1\times {\mathrm{761}}^1$

素因数の和:1123

約数の個数: 40

約数和(自身を含む): 49606200

約数和(自身を除く): 28359080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 349, 698, 761, 1396, 1522, 1745, 2792, 3044, 3490, 3805, 5584, 6088, 6980, 7610, 12176, 13960, 15220, 27920, 30440, 60880, 265589, 531178, 1062356, 1327945, 2124712, 2655890, 4249424, 5311780, 10623560, 21247120]

約数ペア:

[(1, 21247120), (2, 10623560), (4, 5311780), (5, 4249424), (8, 2655890), (10, 2124712), (16, 1327945), (20, 1062356), (40, 531178), (80, 265589), (349, 60880), (698, 30440), (761, 27920), (1396, 15220), (1522, 13960), (1745, 12176), (2792, 7610), (3044, 6980), (3490, 6088), (3805, 5584)]