20988009

素因数分解:

$3^2\times 7^1\times {\mathrm{79}}^1\times {\mathrm{4217}}^1$

素因数の和:4309

約数の個数: 24

約数和(自身を含む): 35093760

約数和(自身を除く): 14105751

約数列:

[1, 3, 7, 9, 21, 63, 79, 237, 553, 711, 1659, 4217, 4977, 12651, 29519, 37953, 88557, 265671, 333143, 999429, 2332001, 2998287, 6996003, 20988009]

約数ペア:

[(1, 20988009), (3, 6996003), (7, 2998287), (9, 2332001), (21, 999429), (63, 333143), (79, 265671), (237, 88557), (553, 37953), (711, 29519), (1659, 12651), (4217, 4977)]