21125005

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{7247}}^1$

素因数の和:7316

約数の個数: 16

約数和(自身を含む): 28180224

約数和(自身を除く): 7055219

約数列:

[1, 5, 11, 53, 55, 265, 583, 2915, 7247, 36235, 79717, 384091, 398585, 1920455, 4225001, 21125005]

約数ペア:

[(1, 21125005), (5, 4225001), (11, 1920455), (53, 398585), (55, 384091), (265, 79717), (583, 36235), (2915, 7247)]