21681945

素因数分解:

$3^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{107}}^1$

素因数の和:219

約数の個数: 64

約数和(自身を含む): 41472000

約数和(自身を除く): 19790055

約数列:

[1, 3, 5, 9, 15, 19, 27, 45, 57, 79, 95, 107, 135, 171, 237, 285, 321, 395, 513, 535, 711, 855, 963, 1185, 1501, 1605, 2033, 2133, 2565, 2889, 3555, 4503, 4815, 6099, 7505, 8453, 10165, 10665, 13509, 14445, 18297, 22515, 25359, 30495, 40527, 42265, 54891, 67545, 76077, 91485, 126795, 160607, 202635, 228231, 274455, 380385, 481821, 803035, 1141155, 1445463, 2409105, 4336389, 7227315, 21681945]

約数ペア:

[(1, 21681945), (3, 7227315), (5, 4336389), (9, 2409105), (15, 1445463), (19, 1141155), (27, 803035), (45, 481821), (57, 380385), (79, 274455), (95, 228231), (107, 202635), (135, 160607), (171, 126795), (237, 91485), (285, 76077), (321, 67545), (395, 54891), (513, 42265), (535, 40527), (711, 30495), (855, 25359), (963, 22515), (1185, 18297), (1501, 14445), (1605, 13509), (2033, 10665), (2133, 10165), (2565, 8453), (2889, 7505), (3555, 6099), (4503, 4815)]