400018280

素因数分解:

$2^3\times 5^1\times {\mathrm{10000457}}^1$

素因数の和:10000468

約数の個数: 16

約数和(自身を含む): 900041220

約数和(自身を除く): 500022940

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 10000457, 20000914, 40001828, 50002285, 80003656, 100004570, 200009140, 400018280]

約数ペア:

[(1, 400018280), (2, 200009140), (4, 100004570), (5, 80003656), (8, 50002285), (10, 40001828), (20, 20000914), (40, 10000457)]