21212785

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{409}}^1$

素因数の和:489

約数の個数: 32

約数和(自身を含む): 29756160

約数和(自身を除く): 8543375

約数列:

[1, 5, 11, 23, 41, 55, 115, 205, 253, 409, 451, 943, 1265, 2045, 2255, 4499, 4715, 9407, 10373, 16769, 22495, 47035, 51865, 83845, 103477, 184459, 385687, 517385, 922295, 1928435, 4242557, 21212785]

約数ペア:

[(1, 21212785), (5, 4242557), (11, 1928435), (23, 922295), (41, 517385), (55, 385687), (115, 184459), (205, 103477), (253, 83845), (409, 51865), (451, 47035), (943, 22495), (1265, 16769), (2045, 10373), (2255, 9407), (4499, 4715)]