20812540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{3163}}^1$

素因数の和:3226

約数の個数: 48

約数和(自身を含む): 51028992

約数和(自身を除く): 30216452

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 70, 94, 140, 188, 235, 329, 470, 658, 940, 1316, 1645, 3163, 3290, 6326, 6580, 12652, 15815, 22141, 31630, 44282, 63260, 88564, 110705, 148661, 221410, 297322, 442820, 594644, 743305, 1040627, 1486610, 2081254, 2973220, 4162508, 5203135, 10406270, 20812540]

約数ペア:

[(1, 20812540), (2, 10406270), (4, 5203135), (5, 4162508), (7, 2973220), (10, 2081254), (14, 1486610), (20, 1040627), (28, 743305), (35, 594644), (47, 442820), (70, 297322), (94, 221410), (140, 148661), (188, 110705), (235, 88564), (329, 63260), (470, 44282), (658, 31630), (940, 22141), (1316, 15815), (1645, 12652), (3163, 6580), (3290, 6326)]