21876421

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{73}}^1\times {\mathrm{1381}}^1$

素因数の和:1492

約数の個数: 16

約数和(自身を含む): 26180608

約数和(自身を除く): 4304187

約数列:

[1, 7, 31, 73, 217, 511, 1381, 2263, 9667, 15841, 42811, 100813, 299677, 705691, 3125203, 21876421]

約数ペア:

[(1, 21876421), (7, 3125203), (31, 705691), (73, 299677), (217, 100813), (511, 42811), (1381, 15841), (2263, 9667)]