21217749

素因数分解:

$3^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{6781}}^1$

素因数の和:6940

約数の個数: 16

約数和(自身を含む): 32553600

約数和(自身を除く): 11335851

約数列:

[1, 3, 7, 21, 149, 447, 1043, 3129, 6781, 20343, 47467, 142401, 1010369, 3031107, 7072583, 21217749]

約数ペア:

[(1, 21217749), (3, 7072583), (7, 3031107), (21, 1010369), (149, 142401), (447, 47467), (1043, 20343), (3129, 6781)]