21055792

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{199}}^1\times {\mathrm{389}}^1$

素因数の和:613

約数の個数: 40

約数和(自身を含む): 43524000

約数和(自身を除く): 22468208

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 199, 272, 389, 398, 778, 796, 1556, 1592, 3112, 3184, 3383, 6224, 6613, 6766, 13226, 13532, 26452, 27064, 52904, 54128, 77411, 105808, 154822, 309644, 619288, 1238576, 1315987, 2631974, 5263948, 10527896, 21055792]

約数ペア:

[(1, 21055792), (2, 10527896), (4, 5263948), (8, 2631974), (16, 1315987), (17, 1238576), (34, 619288), (68, 309644), (136, 154822), (199, 105808), (272, 77411), (389, 54128), (398, 52904), (778, 27064), (796, 26452), (1556, 13532), (1592, 13226), (3112, 6766), (3184, 6613), (3383, 6224)]