21972531

素因数分解:

$3^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{7867}}^1$

素因数の和:7903

約数の個数: 24

約数和(自身を含む): 35878080

約数和(自身を除く): 13905549

約数列:

[1, 3, 7, 19, 21, 49, 57, 133, 147, 399, 931, 2793, 7867, 23601, 55069, 149473, 165207, 385483, 448419, 1046311, 1156449, 3138933, 7324177, 21972531]

約数ペア:

[(1, 21972531), (3, 7324177), (7, 3138933), (19, 1156449), (21, 1046311), (49, 448419), (57, 385483), (133, 165207), (147, 149473), (399, 55069), (931, 23601), (2793, 7867)]