21109005

素因数分解:

$3^4\times 5^1\times {\mathrm{52121}}^1$

素因数の和:52138

約数の個数: 20

約数和(自身を含む): 37840572

約数和(自身を除く): 16731567

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52121, 156363, 260605, 469089, 781815, 1407267, 2345445, 4221801, 7036335, 21109005]

約数ペア:

[(1, 21109005), (3, 7036335), (5, 4221801), (9, 2345445), (15, 1407267), (27, 781815), (45, 469089), (81, 260605), (135, 156363), (405, 52121)]