21561520

素因数分解:

$2^4\times 5^1\times {\mathrm{269519}}^1$

素因数の和:269532

約数の個数: 20

約数和(自身を含む): 50130720

約数和(自身を除く): 28569200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 269519, 539038, 1078076, 1347595, 2156152, 2695190, 4312304, 5390380, 10780760, 21561520]

約数ペア:

[(1, 21561520), (2, 10780760), (4, 5390380), (5, 4312304), (8, 2695190), (10, 2156152), (16, 1347595), (20, 1078076), (40, 539038), (80, 269519)]