21392120

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{163}}^1\times {\mathrm{193}}^1$

素因数の和:384

約数の個数: 64

約数和(自身を含む): 51541920

約数和(自身を除く): 30149800

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 163, 170, 193, 326, 340, 386, 652, 680, 772, 815, 965, 1304, 1544, 1630, 1930, 2771, 3260, 3281, 3860, 5542, 6520, 6562, 7720, 11084, 13124, 13855, 16405, 22168, 26248, 27710, 31459, 32810, 55420, 62918, 65620, 110840, 125836, 131240, 157295, 251672, 314590, 534803, 629180, 1069606, 1258360, 2139212, 2674015, 4278424, 5348030, 10696060, 21392120]

約数ペア:

[(1, 21392120), (2, 10696060), (4, 5348030), (5, 4278424), (8, 2674015), (10, 2139212), (17, 1258360), (20, 1069606), (34, 629180), (40, 534803), (68, 314590), (85, 251672), (136, 157295), (163, 131240), (170, 125836), (193, 110840), (326, 65620), (340, 62918), (386, 55420), (652, 32810), (680, 31459), (772, 27710), (815, 26248), (965, 22168), (1304, 16405), (1544, 13855), (1630, 13124), (1930, 11084), (2771, 7720), (3260, 6562), (3281, 6520), (3860, 5542)]