640940

素因数分解:

$2^2\times 5^1\times {\mathrm{73}}^1\times {\mathrm{439}}^1$

素因数の和:521

約数の個数: 24

約数和(自身を含む): 1367520

約数和(自身を除く): 726580

約数列:

[1, 2, 4, 5, 10, 20, 73, 146, 292, 365, 439, 730, 878, 1460, 1756, 2195, 4390, 8780, 32047, 64094, 128188, 160235, 320470, 640940]

約数ペア:

[(1, 640940), (2, 320470), (4, 160235), (5, 128188), (10, 64094), (20, 32047), (73, 8780), (146, 4390), (292, 2195), (365, 1756), (439, 1460), (730, 878)]