21729520

素因数分解:

$2^4\times 5^1\times {\mathrm{271619}}^1$

素因数の和:271632

約数の個数: 20

約数和(自身を含む): 50521320

約数和(自身を除く): 28791800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 271619, 543238, 1086476, 1358095, 2172952, 2716190, 4345904, 5432380, 10864760, 21729520]

約数ペア:

[(1, 21729520), (2, 10864760), (4, 5432380), (5, 4345904), (8, 2716190), (10, 2172952), (16, 1358095), (20, 1086476), (40, 543238), (80, 271619)]