21012981

素因数分解:

$3^1\times {\mathrm{11}}^2\times {\mathrm{107}}^1\times {\mathrm{541}}^1$

素因数の和:673

約数の個数: 24

約数和(自身を含む): 31141152

約数和(自身を除く): 10128171

約数列:

[1, 3, 11, 33, 107, 121, 321, 363, 541, 1177, 1623, 3531, 5951, 12947, 17853, 38841, 57887, 65461, 173661, 196383, 636757, 1910271, 7004327, 21012981]

約数ペア:

[(1, 21012981), (3, 7004327), (11, 1910271), (33, 636757), (107, 196383), (121, 173661), (321, 65461), (363, 57887), (541, 38841), (1177, 17853), (1623, 12947), (3531, 5951)]