21988269

素因数分解:

$3^2\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{1487}}^1$

素因数の和:1577

約数の個数: 24

約数和(自身を含む): 33426432

約数和(自身を除く): 11438163

約数列:

[1, 3, 9, 31, 53, 93, 159, 279, 477, 1487, 1643, 4461, 4929, 13383, 14787, 46097, 78811, 138291, 236433, 414873, 709299, 2443141, 7329423, 21988269]

約数ペア:

[(1, 21988269), (3, 7329423), (9, 2443141), (31, 709299), (53, 414873), (93, 236433), (159, 138291), (279, 78811), (477, 46097), (1487, 14787), (1643, 13383), (4461, 4929)]