21021855

素因数分解:

$3^1\times 5^1\times {\mathrm{317}}^1\times {\mathrm{4421}}^1$

素因数の和:4746

約数の個数: 16

約数和(自身を含む): 33748704

約数和(自身を除く): 12726849

約数列:

[1, 3, 5, 15, 317, 951, 1585, 4421, 4755, 13263, 22105, 66315, 1401457, 4204371, 7007285, 21021855]

約数ペア:

[(1, 21021855), (3, 7007285), (5, 4204371), (15, 1401457), (317, 66315), (951, 22105), (1585, 13263), (4421, 4755)]