19999945

素因数分解:

$5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{97}}^1\times {\mathrm{137}}^1$

素因数の和:289

約数の個数: 32

約数和(自身を含む): 28562688

約数和(自身を除く): 8562743

約数列:

[1, 5, 7, 35, 43, 97, 137, 215, 301, 485, 679, 685, 959, 1505, 3395, 4171, 4795, 5891, 13289, 20855, 29197, 29455, 41237, 66445, 93023, 145985, 206185, 465115, 571427, 2857135, 3999989, 19999945]

約数ペア:

[(1, 19999945), (5, 3999989), (7, 2857135), (35, 571427), (43, 465115), (97, 206185), (137, 145985), (215, 93023), (301, 66445), (485, 41237), (679, 29455), (685, 29197), (959, 20855), (1505, 13289), (3395, 5891), (4171, 4795)]