21280270

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^2\times {\mathrm{43}}^1\times {\mathrm{409}}^1$

素因数の和:481

約数の個数: 48

約数和(自身を含む): 43187760

約数和(自身を除く): 21907490

約数列:

[1, 2, 5, 10, 11, 22, 43, 55, 86, 110, 121, 215, 242, 409, 430, 473, 605, 818, 946, 1210, 2045, 2365, 4090, 4499, 4730, 5203, 8998, 10406, 17587, 22495, 26015, 35174, 44990, 49489, 52030, 87935, 98978, 175870, 193457, 247445, 386914, 494890, 967285, 1934570, 2128027, 4256054, 10640135, 21280270]

約数ペア:

[(1, 21280270), (2, 10640135), (5, 4256054), (10, 2128027), (11, 1934570), (22, 967285), (43, 494890), (55, 386914), (86, 247445), (110, 193457), (121, 175870), (215, 98978), (242, 87935), (409, 52030), (430, 49489), (473, 44990), (605, 35174), (818, 26015), (946, 22495), (1210, 17587), (2045, 10406), (2365, 8998), (4090, 5203), (4499, 4730)]