21155499

素因数分解:

$3^4\times {\mathrm{47}}^1\times {\mathrm{5557}}^1$

素因数の和:5616

約数の個数: 20

約数和(自身を含む): 32280864

約数和(自身を除く): 11125365

約数列:

[1, 3, 9, 27, 47, 81, 141, 423, 1269, 3807, 5557, 16671, 50013, 150039, 261179, 450117, 783537, 2350611, 7051833, 21155499]

約数ペア:

[(1, 21155499), (3, 7051833), (9, 2350611), (27, 783537), (47, 450117), (81, 261179), (141, 150039), (423, 50013), (1269, 16671), (3807, 5557)]