21872217

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{67}}^1\times {\mathrm{173}}^1$

素因数の和:297

約数の個数: 32

約数和(自身を含む): 32372352

約数和(自身を除く): 10500135

約数列:

[1, 3, 17, 37, 51, 67, 111, 173, 201, 519, 629, 1139, 1887, 2479, 2941, 3417, 6401, 7437, 8823, 11591, 19203, 34773, 42143, 108817, 126429, 197047, 326451, 428867, 591141, 1286601, 7290739, 21872217]

約数ペア:

[(1, 21872217), (3, 7290739), (17, 1286601), (37, 591141), (51, 428867), (67, 326451), (111, 197047), (173, 126429), (201, 108817), (519, 42143), (629, 34773), (1139, 19203), (1887, 11591), (2479, 8823), (2941, 7437), (3417, 6401)]