21978405

素因数分解:

$3^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{2293}}^1$

素因数の和:2378

約数の個数: 32

約数和(自身を含む): 39640320

約数和(自身を除く): 17661915

約数列:

[1, 3, 5, 9, 15, 27, 45, 71, 135, 213, 355, 639, 1065, 1917, 2293, 3195, 6879, 9585, 11465, 20637, 34395, 61911, 103185, 162803, 309555, 488409, 814015, 1465227, 2442045, 4395681, 7326135, 21978405]

約数ペア:

[(1, 21978405), (3, 7326135), (5, 4395681), (9, 2442045), (15, 1465227), (27, 814015), (45, 488409), (71, 309555), (135, 162803), (213, 103185), (355, 61911), (639, 34395), (1065, 20637), (1917, 11465), (2293, 9585), (3195, 6879)]