21891925

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{7237}}^1$

素因数の和:7269

約数の個数: 18

約数和(自身を含む): 29842274

約数和(自身を除く): 7950349

約数列:

[1, 5, 11, 25, 55, 121, 275, 605, 3025, 7237, 36185, 79607, 180925, 398035, 875677, 1990175, 4378385, 21891925]

約数ペア:

[(1, 21891925), (5, 4378385), (11, 1990175), (25, 875677), (55, 398035), (121, 180925), (275, 79607), (605, 36185), (3025, 7237)]