21128653

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{809}}^1$

素因数の和:877

約数の個数: 24

約数和(自身を含む): 27147960

約数和(自身を除く): 6019307

約数列:

[1, 7, 13, 41, 49, 91, 287, 533, 637, 809, 2009, 3731, 5663, 10517, 26117, 33169, 39641, 73619, 232183, 431197, 515333, 1625281, 3018379, 21128653]

約数ペア:

[(1, 21128653), (7, 3018379), (13, 1625281), (41, 515333), (49, 431197), (91, 232183), (287, 73619), (533, 39641), (637, 33169), (809, 26117), (2009, 10517), (3731, 5663)]