21908887

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{509}}^1$

素因数の和:583

約数の個数: 32

約数和(自身を含む): 30159360

約数和(自身を除く): 8250473

約数列:

[1, 7, 11, 13, 43, 77, 91, 143, 301, 473, 509, 559, 1001, 3311, 3563, 3913, 5599, 6149, 6617, 21887, 39193, 43043, 46319, 72787, 153209, 240757, 284531, 509509, 1685299, 1991717, 3129841, 21908887]

約数ペア:

[(1, 21908887), (7, 3129841), (11, 1991717), (13, 1685299), (43, 509509), (77, 284531), (91, 240757), (143, 153209), (301, 72787), (473, 46319), (509, 43043), (559, 39193), (1001, 21887), (3311, 6617), (3563, 6149), (3913, 5599)]