21781485

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{557}}^1$

素因数の和:658

約数の個数: 48

約数和(自身を含む): 41783040

約数和(自身を除く): 20001555

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 55, 79, 99, 165, 237, 395, 495, 557, 711, 869, 1185, 1671, 2607, 2785, 3555, 4345, 5013, 6127, 7821, 8355, 13035, 18381, 25065, 30635, 39105, 44003, 55143, 91905, 132009, 220015, 275715, 396027, 484033, 660045, 1452099, 1980135, 2420165, 4356297, 7260495, 21781485]

約数ペア:

[(1, 21781485), (3, 7260495), (5, 4356297), (9, 2420165), (11, 1980135), (15, 1452099), (33, 660045), (45, 484033), (55, 396027), (79, 275715), (99, 220015), (165, 132009), (237, 91905), (395, 55143), (495, 44003), (557, 39105), (711, 30635), (869, 25065), (1185, 18381), (1671, 13035), (2607, 8355), (2785, 7821), (3555, 6127), (4345, 5013)]