21056997

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{157}}^1\times {\mathrm{181}}^1$

素因数の和:373

約数の個数: 32

約数和(自身を含む): 32206720

約数和(自身を除く): 11149723

約数列:

[1, 3, 13, 19, 39, 57, 157, 181, 247, 471, 543, 741, 2041, 2353, 2983, 3439, 6123, 7059, 8949, 10317, 28417, 38779, 44707, 85251, 116337, 134121, 369421, 539923, 1108263, 1619769, 7018999, 21056997]

約数ペア:

[(1, 21056997), (3, 7018999), (13, 1619769), (19, 1108263), (39, 539923), (57, 369421), (157, 134121), (181, 116337), (247, 85251), (471, 44707), (543, 38779), (741, 28417), (2041, 10317), (2353, 8949), (2983, 7059), (3439, 6123)]