21721905

素因数分解:

$3^3\times 5^1\times {\mathrm{160903}}^1$

素因数の和:160917

約数の個数: 16

約数和(自身を含む): 38616960

約数和(自身を除く): 16895055

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 160903, 482709, 804515, 1448127, 2413545, 4344381, 7240635, 21721905]

約数ペア:

[(1, 21721905), (3, 7240635), (5, 4344381), (9, 2413545), (15, 1448127), (27, 804515), (45, 482709), (135, 160903)]