213567921

素因数分解:

$3^4\times 7^3\times {\mathrm{7687}}^1$

素因数の和:7720

約数の個数: 40

約数和(自身を含む): 372099200

約数和(自身を除く): 158531279

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 81, 147, 189, 343, 441, 567, 1029, 1323, 3087, 3969, 7687, 9261, 23061, 27783, 53809, 69183, 161427, 207549, 376663, 484281, 622647, 1129989, 1452843, 2636641, 3389967, 4358529, 7909923, 10169901, 23729769, 30509703, 71189307, 213567921]

約数ペア:

[(1, 213567921), (3, 71189307), (7, 30509703), (9, 23729769), (21, 10169901), (27, 7909923), (49, 4358529), (63, 3389967), (81, 2636641), (147, 1452843), (189, 1129989), (343, 622647), (441, 484281), (567, 376663), (1029, 207549), (1323, 161427), (3087, 69183), (3969, 53809), (7687, 27783), (9261, 23061)]