21721581

素因数分解:

$3^3\times 7^1\times {\mathrm{281}}^1\times {\mathrm{409}}^1$

素因数の和:706

約数の個数: 32

約数和(自身を含む): 36998400

約数和(自身を除く): 15276819

約数列:

[1, 3, 7, 9, 21, 27, 63, 189, 281, 409, 843, 1227, 1967, 2529, 2863, 3681, 5901, 7587, 8589, 11043, 17703, 25767, 53109, 77301, 114929, 344787, 804503, 1034361, 2413509, 3103083, 7240527, 21721581]

約数ペア:

[(1, 21721581), (3, 7240527), (7, 3103083), (9, 2413509), (21, 1034361), (27, 804503), (63, 344787), (189, 114929), (281, 77301), (409, 53109), (843, 25767), (1227, 17703), (1967, 11043), (2529, 8589), (2863, 7587), (3681, 5901)]