21257187

素因数分解:

$3^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1\times {\mathrm{269}}^1$

素因数の和:403

約数の個数: 32

約数和(自身を含む): 33592320

約数和(自身を除く): 12335133

約数列:

[1, 3, 7, 21, 53, 71, 159, 213, 269, 371, 497, 807, 1113, 1491, 1883, 3763, 5649, 11289, 14257, 19099, 26341, 42771, 57297, 79023, 99799, 133693, 299397, 401079, 1012247, 3036741, 7085729, 21257187]

約数ペア:

[(1, 21257187), (3, 7085729), (7, 3036741), (21, 1012247), (53, 401079), (71, 299397), (159, 133693), (213, 99799), (269, 79023), (371, 57297), (497, 42771), (807, 26341), (1113, 19099), (1491, 14257), (1883, 11289), (3763, 5649)]