21680820

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{17207}}^1$

素因数の和:17229

約数の個数: 72

約数和(自身を含む): 75164544

約数和(自身を除く): 53483724

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 17207, 34414, 51621, 68828, 86035, 103242, 120449, 154863, 172070, 206484, 240898, 258105, 309726, 344140, 361347, 481796, 516210, 602245, 619452, 722694, 774315, 1032420, 1084041, 1204490, 1445388, 1548630, 1806735, 2168082, 2408980, 3097260, 3613470, 4336164, 5420205, 7226940, 10840410, 21680820]

約数ペア:

[(1, 21680820), (2, 10840410), (3, 7226940), (4, 5420205), (5, 4336164), (6, 3613470), (7, 3097260), (9, 2408980), (10, 2168082), (12, 1806735), (14, 1548630), (15, 1445388), (18, 1204490), (20, 1084041), (21, 1032420), (28, 774315), (30, 722694), (35, 619452), (36, 602245), (42, 516210), (45, 481796), (60, 361347), (63, 344140), (70, 309726), (84, 258105), (90, 240898), (105, 206484), (126, 172070), (140, 154863), (180, 120449), (210, 103242), (252, 86035), (315, 68828), (420, 51621), (630, 34414), (1260, 17207)]