20921985

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{3907}}^1$

素因数の和:3942

約数の個数: 48

約数和(自身を含む): 43894656

約数和(自身を除く): 22972671

約数列:

[1, 3, 5, 7, 9, 15, 17, 21, 35, 45, 51, 63, 85, 105, 119, 153, 255, 315, 357, 595, 765, 1071, 1785, 3907, 5355, 11721, 19535, 27349, 35163, 58605, 66419, 82047, 136745, 175815, 199257, 246141, 332095, 410235, 464933, 597771, 996285, 1230705, 1394799, 2324665, 2988855, 4184397, 6973995, 20921985]

約数ペア:

[(1, 20921985), (3, 6973995), (5, 4184397), (7, 2988855), (9, 2324665), (15, 1394799), (17, 1230705), (21, 996285), (35, 597771), (45, 464933), (51, 410235), (63, 332095), (85, 246141), (105, 199257), (119, 175815), (153, 136745), (255, 82047), (315, 66419), (357, 58605), (595, 35163), (765, 27349), (1071, 19535), (1785, 11721), (3907, 5355)]