21080397

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{331}}^1$

素因数の和:441

約数の個数: 32

約数和(自身を含む): 32126976

約数和(自身を除く): 11046579

約数列:

[1, 3, 13, 23, 39, 69, 71, 213, 299, 331, 897, 923, 993, 1633, 2769, 4303, 4899, 7613, 12909, 21229, 22839, 23501, 63687, 70503, 98969, 296907, 305513, 540523, 916539, 1621569, 7026799, 21080397]

約数ペア:

[(1, 21080397), (3, 7026799), (13, 1621569), (23, 916539), (39, 540523), (69, 305513), (71, 296907), (213, 98969), (299, 70503), (331, 63687), (897, 23501), (923, 22839), (993, 21229), (1633, 12909), (2769, 7613), (4303, 4899)]