21919280

素因数分解:

$2^4\times 5^1\times {\mathrm{311}}^1\times {\mathrm{881}}^1$

素因数の和:1205

約数の個数: 40

約数和(自身を含む): 51184224

約数和(自身を除く): 29264944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 311, 622, 881, 1244, 1555, 1762, 2488, 3110, 3524, 4405, 4976, 6220, 7048, 8810, 12440, 14096, 17620, 24880, 35240, 70480, 273991, 547982, 1095964, 1369955, 2191928, 2739910, 4383856, 5479820, 10959640, 21919280]

約数ペア:

[(1, 21919280), (2, 10959640), (4, 5479820), (5, 4383856), (8, 2739910), (10, 2191928), (16, 1369955), (20, 1095964), (40, 547982), (80, 273991), (311, 70480), (622, 35240), (881, 24880), (1244, 17620), (1555, 14096), (1762, 12440), (2488, 8810), (3110, 7048), (3524, 6220), (4405, 4976)]