81723280

素因数分解:

$2^4\times 5^1\times {\mathrm{1021541}}^1$

素因数の和:1021554

約数の個数: 20

約数和(自身を含む): 190006812

約数和(自身を除く): 108283532

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1021541, 2043082, 4086164, 5107705, 8172328, 10215410, 16344656, 20430820, 40861640, 81723280]

約数ペア:

[(1, 81723280), (2, 40861640), (4, 20430820), (5, 16344656), (8, 10215410), (10, 8172328), (16, 5107705), (20, 4086164), (40, 2043082), (80, 1021541)]