81089920

素因数分解:

$2^7\times 5^1\times {\mathrm{126703}}^1$

素因数の和:126722

約数の個数: 32

約数和(自身を含む): 193857120

約数和(自身を除く): 112767200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 126703, 253406, 506812, 633515, 1013624, 1267030, 2027248, 2534060, 4054496, 5068120, 8108992, 10136240, 16217984, 20272480, 40544960, 81089920]

約数ペア:

[(1, 81089920), (2, 40544960), (4, 20272480), (5, 16217984), (8, 10136240), (10, 8108992), (16, 5068120), (20, 4054496), (32, 2534060), (40, 2027248), (64, 1267030), (80, 1013624), (128, 633515), (160, 506812), (320, 253406), (640, 126703)]