21289520

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{5431}}^1$

素因数の和:5458

約数の個数: 60

約数和(自身を含む): 57590064

約数和(自身を除く): 36300544

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 5431, 10862, 21724, 27155, 38017, 43448, 54310, 76034, 86896, 108620, 152068, 190085, 217240, 266119, 304136, 380170, 434480, 532238, 608272, 760340, 1064476, 1330595, 1520680, 2128952, 2661190, 3041360, 4257904, 5322380, 10644760, 21289520]

約数ペア:

[(1, 21289520), (2, 10644760), (4, 5322380), (5, 4257904), (7, 3041360), (8, 2661190), (10, 2128952), (14, 1520680), (16, 1330595), (20, 1064476), (28, 760340), (35, 608272), (40, 532238), (49, 434480), (56, 380170), (70, 304136), (80, 266119), (98, 217240), (112, 190085), (140, 152068), (196, 108620), (245, 86896), (280, 76034), (392, 54310), (490, 43448), (560, 38017), (784, 27155), (980, 21724), (1960, 10862), (3920, 5431)]