20657720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^2\times {\mathrm{1787}}^1$

素因数の和:1832

約数の個数: 48

約数和(自身を含む): 49402440

約数和(自身を除く): 28744720

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 289, 340, 578, 680, 1156, 1445, 1787, 2312, 2890, 3574, 5780, 7148, 8935, 11560, 14296, 17870, 30379, 35740, 60758, 71480, 121516, 151895, 243032, 303790, 516443, 607580, 1032886, 1215160, 2065772, 2582215, 4131544, 5164430, 10328860, 20657720]

約数ペア:

[(1, 20657720), (2, 10328860), (4, 5164430), (5, 4131544), (8, 2582215), (10, 2065772), (17, 1215160), (20, 1032886), (34, 607580), (40, 516443), (68, 303790), (85, 243032), (136, 151895), (170, 121516), (289, 71480), (340, 60758), (578, 35740), (680, 30379), (1156, 17870), (1445, 14296), (1787, 11560), (2312, 8935), (2890, 7148), (3574, 5780)]