20680840

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^2\times {\mathrm{1789}}^1$

素因数の和:1834

約数の個数: 48

約数和(自身を含む): 49457700

約数和(自身を除く): 28776860

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 289, 340, 578, 680, 1156, 1445, 1789, 2312, 2890, 3578, 5780, 7156, 8945, 11560, 14312, 17890, 30413, 35780, 60826, 71560, 121652, 152065, 243304, 304130, 517021, 608260, 1034042, 1216520, 2068084, 2585105, 4136168, 5170210, 10340420, 20680840]

約数ペア:

[(1, 20680840), (2, 10340420), (4, 5170210), (5, 4136168), (8, 2585105), (10, 2068084), (17, 1216520), (20, 1034042), (34, 608260), (40, 517021), (68, 304130), (85, 243304), (136, 152065), (170, 121652), (289, 71560), (340, 60826), (578, 35780), (680, 30413), (1156, 17890), (1445, 14312), (1789, 11560), (2312, 8945), (2890, 7156), (3578, 5780)]