21356489

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{389}}^1$

素因数の和:461

約数の個数: 32

約数和(自身を含む): 28753920

約数和(自身を除く): 7397431

約数列:

[1, 7, 11, 23, 31, 77, 161, 217, 253, 341, 389, 713, 1771, 2387, 2723, 4279, 4991, 7843, 8947, 12059, 29953, 54901, 62629, 84413, 98417, 132649, 277357, 688919, 928543, 1941499, 3050927, 21356489]

約数ペア:

[(1, 21356489), (7, 3050927), (11, 1941499), (23, 928543), (31, 688919), (77, 277357), (161, 132649), (217, 98417), (253, 84413), (341, 62629), (389, 54901), (713, 29953), (1771, 12059), (2387, 8947), (2723, 7843), (4279, 4991)]