21380458888

素因数分解:

$2^3\times {\mathrm{1723}}^1\times {\mathrm{1551107}}^1$

素因数の和:1552836

約数の個数: 16

約数和(自身を含む): 40111652880

約数和(自身を除く): 18731193992

約数列:

[1, 2, 4, 8, 1723, 3446, 6892, 13784, 1551107, 3102214, 6204428, 12408856, 2672557361, 5345114722, 10690229444, 21380458888]

約数ペア:

[(1, 21380458888), (2, 10690229444), (4, 5345114722), (8, 2672557361), (1723, 12408856), (3446, 6204428), (6892, 3102214), (13784, 1551107)]