21105318

素因数分解:

$2^1\times 3^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{103}}^1$

素因数の和:229

約数の個数: 64

約数和(自身を含む): 47803392

約数和(自身を除く): 26698074

約数列:

[1, 2, 3, 6, 13, 26, 37, 39, 71, 74, 78, 103, 111, 142, 206, 213, 222, 309, 426, 481, 618, 923, 962, 1339, 1443, 1846, 2627, 2678, 2769, 2886, 3811, 4017, 5254, 5538, 7313, 7622, 7881, 8034, 11433, 14626, 15762, 21939, 22866, 34151, 43878, 49543, 68302, 95069, 99086, 102453, 148629, 190138, 204906, 270581, 285207, 297258, 541162, 570414, 811743, 1623486, 3517553, 7035106, 10552659, 21105318]

約数ペア:

[(1, 21105318), (2, 10552659), (3, 7035106), (6, 3517553), (13, 1623486), (26, 811743), (37, 570414), (39, 541162), (71, 297258), (74, 285207), (78, 270581), (103, 204906), (111, 190138), (142, 148629), (206, 102453), (213, 99086), (222, 95069), (309, 68302), (426, 49543), (481, 43878), (618, 34151), (923, 22866), (962, 21939), (1339, 15762), (1443, 14626), (1846, 11433), (2627, 8034), (2678, 7881), (2769, 7622), (2886, 7313), (3811, 5538), (4017, 5254)]