21218480

素因数分解:

$2^4\times 5^1\times {\mathrm{265231}}^1$

素因数の和:265244

約数の個数: 20

約数和(自身を含む): 49333152

約数和(自身を除く): 28114672

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265231, 530462, 1060924, 1326155, 2121848, 2652310, 4243696, 5304620, 10609240, 21218480]

約数ペア:

[(1, 21218480), (2, 10609240), (4, 5304620), (5, 4243696), (8, 2652310), (10, 2121848), (16, 1326155), (20, 1060924), (40, 530462), (80, 265231)]