21406815

素因数分解:

$3^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{617}}^1$

素因数の和:888

約数の個数: 32

約数和(自身を含む): 38266560

約数和(自身を除く): 16859745

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 257, 617, 771, 1285, 1851, 2313, 3085, 3855, 5553, 6939, 9255, 11565, 16659, 27765, 34695, 83295, 158569, 475707, 792845, 1427121, 2378535, 4281363, 7135605, 21406815]

約数ペア:

[(1, 21406815), (3, 7135605), (5, 4281363), (9, 2378535), (15, 1427121), (27, 792845), (45, 475707), (135, 158569), (257, 83295), (617, 34695), (771, 27765), (1285, 16659), (1851, 11565), (2313, 9255), (3085, 6939), (3855, 5553)]