21998140

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{139}}^1\times {\mathrm{193}}^1$

素因数の和:382

約数の個数: 48

約数和(自身を含む): 47910240

約数和(自身を除く): 25912100

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 139, 164, 193, 205, 278, 386, 410, 556, 695, 772, 820, 965, 1390, 1930, 2780, 3860, 5699, 7913, 11398, 15826, 22796, 26827, 28495, 31652, 39565, 53654, 56990, 79130, 107308, 113980, 134135, 158260, 268270, 536540, 1099907, 2199814, 4399628, 5499535, 10999070, 21998140]

約数ペア:

[(1, 21998140), (2, 10999070), (4, 5499535), (5, 4399628), (10, 2199814), (20, 1099907), (41, 536540), (82, 268270), (139, 158260), (164, 134135), (193, 113980), (205, 107308), (278, 79130), (386, 56990), (410, 53654), (556, 39565), (695, 31652), (772, 28495), (820, 26827), (965, 22796), (1390, 15826), (1930, 11398), (2780, 7913), (3860, 5699)]