217640915

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{787}}^1$

素因数の和:923

約数の個数: 32

約数和(自身を含む): 285949440

約数和(自身を除く): 68308525

約数列:

[1, 5, 19, 41, 71, 95, 205, 355, 779, 787, 1349, 2911, 3895, 3935, 6745, 14555, 14953, 32267, 55309, 55877, 74765, 161335, 276545, 279385, 613073, 1061663, 2290957, 3065365, 5308315, 11454785, 43528183, 217640915]

約数ペア:

[(1, 217640915), (5, 43528183), (19, 11454785), (41, 5308315), (71, 3065365), (95, 2290957), (205, 1061663), (355, 613073), (779, 279385), (787, 276545), (1349, 161335), (2911, 74765), (3895, 55877), (3935, 55309), (6745, 32267), (14555, 14953)]