21387471

素因数分解:

$3^1\times 7^2\times {\mathrm{29}}^2\times {\mathrm{173}}^1$

素因数の和:248

約数の個数: 36

約数和(自身を含む): 34554312

約数和(自身を除く): 13166841

約数列:

[1, 3, 7, 21, 29, 49, 87, 147, 173, 203, 519, 609, 841, 1211, 1421, 2523, 3633, 4263, 5017, 5887, 8477, 15051, 17661, 25431, 35119, 41209, 105357, 123627, 145493, 245833, 436479, 737499, 1018451, 3055353, 7129157, 21387471]

約数ペア:

[(1, 21387471), (3, 7129157), (7, 3055353), (21, 1018451), (29, 737499), (49, 436479), (87, 245833), (147, 145493), (173, 123627), (203, 105357), (519, 41209), (609, 35119), (841, 25431), (1211, 17661), (1421, 15051), (2523, 8477), (3633, 5887), (4263, 5017)]