21081955

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{197}}^1\times {\mathrm{1259}}^1$

素因数の和:1478

約数の個数: 16

約数和(自身を含む): 26943840

約数和(自身を除く): 5861885

約数列:

[1, 5, 17, 85, 197, 985, 1259, 3349, 6295, 16745, 21403, 107015, 248023, 1240115, 4216391, 21081955]

約数ペア:

[(1, 21081955), (5, 4216391), (17, 1240115), (85, 248023), (197, 107015), (985, 21403), (1259, 16745), (3349, 6295)]