21149680

素因数分解:

$2^4\times 5^1\times {\mathrm{264371}}^1$

素因数の和:264384

約数の個数: 20

約数和(自身を含む): 49173192

約数和(自身を除く): 28023512

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264371, 528742, 1057484, 1321855, 2114968, 2643710, 4229936, 5287420, 10574840, 21149680]

約数ペア:

[(1, 21149680), (2, 10574840), (4, 5287420), (5, 4229936), (8, 2643710), (10, 2114968), (16, 1321855), (20, 1057484), (40, 528742), (80, 264371)]