19964540

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{97}}^1\times {\mathrm{251}}^1$

素因数の和:398

約数の個数: 48

約数和(自身を含む): 43563744

約数和(自身を除く): 23599204

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 97, 164, 194, 205, 251, 388, 410, 485, 502, 820, 970, 1004, 1255, 1940, 2510, 3977, 5020, 7954, 10291, 15908, 19885, 20582, 24347, 39770, 41164, 48694, 51455, 79540, 97388, 102910, 121735, 205820, 243470, 486940, 998227, 1996454, 3992908, 4991135, 9982270, 19964540]

約数ペア:

[(1, 19964540), (2, 9982270), (4, 4991135), (5, 3992908), (10, 1996454), (20, 998227), (41, 486940), (82, 243470), (97, 205820), (164, 121735), (194, 102910), (205, 97388), (251, 79540), (388, 51455), (410, 48694), (485, 41164), (502, 39770), (820, 24347), (970, 20582), (1004, 19885), (1255, 15908), (1940, 10291), (2510, 7954), (3977, 5020)]