21654820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{257}}^1\times {\mathrm{383}}^1$

素因数の和:660

約数の個数: 48

約数和(自身を含む): 49932288

約数和(自身を除く): 28277468

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 257, 383, 514, 766, 1028, 1285, 1532, 1915, 2570, 2827, 3830, 4213, 5140, 5654, 7660, 8426, 11308, 14135, 16852, 21065, 28270, 42130, 56540, 84260, 98431, 196862, 393724, 492155, 984310, 1082741, 1968620, 2165482, 4330964, 5413705, 10827410, 21654820]

約数ペア:

[(1, 21654820), (2, 10827410), (4, 5413705), (5, 4330964), (10, 2165482), (11, 1968620), (20, 1082741), (22, 984310), (44, 492155), (55, 393724), (110, 196862), (220, 98431), (257, 84260), (383, 56540), (514, 42130), (766, 28270), (1028, 21065), (1285, 16852), (1532, 14135), (1915, 11308), (2570, 8426), (2827, 7660), (3830, 5654), (4213, 5140)]