21420771

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1$

素因数の和:239

約数の個数: 32

約数和(自身を含む): 31334400

約数和(自身を除く): 9913629

約数列:

[1, 3, 19, 57, 67, 71, 79, 201, 213, 237, 1273, 1349, 1501, 3819, 4047, 4503, 4757, 5293, 5609, 14271, 15879, 16827, 90383, 100567, 106571, 271149, 301701, 319713, 375803, 1127409, 7140257, 21420771]

約数ペア:

[(1, 21420771), (3, 7140257), (19, 1127409), (57, 375803), (67, 319713), (71, 301701), (79, 271149), (201, 106571), (213, 100567), (237, 90383), (1273, 16827), (1349, 15879), (1501, 14271), (3819, 5609), (4047, 5293), (4503, 4757)]