21305920

素因数分解:

$2^6\times 5^1\times {\mathrm{139}}^1\times {\mathrm{479}}^1$

素因数の和:635

約数の個数: 56

約数和(自身を含む): 51206400

約数和(自身を除く): 29900480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 139, 160, 278, 320, 479, 556, 695, 958, 1112, 1390, 1916, 2224, 2395, 2780, 3832, 4448, 4790, 5560, 7664, 8896, 9580, 11120, 15328, 19160, 22240, 30656, 38320, 44480, 66581, 76640, 133162, 153280, 266324, 332905, 532648, 665810, 1065296, 1331620, 2130592, 2663240, 4261184, 5326480, 10652960, 21305920]

約数ペア:

[(1, 21305920), (2, 10652960), (4, 5326480), (5, 4261184), (8, 2663240), (10, 2130592), (16, 1331620), (20, 1065296), (32, 665810), (40, 532648), (64, 332905), (80, 266324), (139, 153280), (160, 133162), (278, 76640), (320, 66581), (479, 44480), (556, 38320), (695, 30656), (958, 22240), (1112, 19160), (1390, 15328), (1916, 11120), (2224, 9580), (2395, 8896), (2780, 7664), (3832, 5560), (4448, 4790)]