21028761

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{181}}^1\times {\mathrm{331}}^1$

素因数の和:534

約数の個数: 32

約数和(自身を含む): 33837440

約数和(自身を除く): 12808679

約数列:

[1, 3, 9, 13, 27, 39, 117, 181, 331, 351, 543, 993, 1629, 2353, 2979, 4303, 4887, 7059, 8937, 12909, 21177, 38727, 59911, 63531, 116181, 179733, 539199, 778843, 1617597, 2336529, 7009587, 21028761]

約数ペア:

[(1, 21028761), (3, 7009587), (9, 2336529), (13, 1617597), (27, 778843), (39, 539199), (117, 179733), (181, 116181), (331, 63531), (351, 59911), (543, 38727), (993, 21177), (1629, 12909), (2353, 8937), (2979, 7059), (4303, 4887)]