18978505

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{787}}^1$

素因数の和:865

約数の個数: 32

約数和(自身を含む): 28594944

約数和(自身を除く): 9616439

約数列:

[1, 5, 7, 13, 35, 53, 65, 91, 265, 371, 455, 689, 787, 1855, 3445, 3935, 4823, 5509, 10231, 24115, 27545, 41711, 51155, 71617, 208555, 291977, 358085, 542243, 1459885, 2711215, 3795701, 18978505]

約数ペア:

[(1, 18978505), (5, 3795701), (7, 2711215), (13, 1459885), (35, 542243), (53, 358085), (65, 291977), (91, 208555), (265, 71617), (371, 51155), (455, 41711), (689, 27545), (787, 24115), (1855, 10231), (3445, 5509), (3935, 4823)]