21507849

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{239}}^1$

素因数の和:363

約数の個数: 40

約数和(自身を含む): 35544960

約数和(自身を除く): 14037111

約数列:

[1, 3, 9, 11, 27, 33, 81, 99, 101, 239, 297, 303, 717, 891, 909, 1111, 2151, 2629, 2727, 3333, 6453, 7887, 8181, 9999, 19359, 23661, 24139, 29997, 70983, 72417, 89991, 212949, 217251, 265529, 651753, 796587, 1955259, 2389761, 7169283, 21507849]

約数ペア:

[(1, 21507849), (3, 7169283), (9, 2389761), (11, 1955259), (27, 796587), (33, 651753), (81, 265529), (99, 217251), (101, 212949), (239, 89991), (297, 72417), (303, 70983), (717, 29997), (891, 24139), (909, 23661), (1111, 19359), (2151, 9999), (2629, 8181), (2727, 7887), (3333, 6453)]