19989305

素因数分解:

$5^1\times 7^2\times {\mathrm{83}}^1\times {\mathrm{983}}^1$

素因数の和:1085

約数の個数: 24

約数和(自身を含む): 28268352

約数和(自身を除く): 8279047

約数列:

[1, 5, 7, 35, 49, 83, 245, 415, 581, 983, 2905, 4067, 4915, 6881, 20335, 34405, 48167, 81589, 240835, 407945, 571123, 2855615, 3997861, 19989305]

約数ペア:

[(1, 19989305), (5, 3997861), (7, 2855615), (35, 571123), (49, 407945), (83, 240835), (245, 81589), (415, 48167), (581, 34405), (983, 20335), (2905, 6881), (4067, 4915)]