21293979

素因数分解:

$3^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{8521}}^1$

素因数の和:8555

約数の個数: 24

約数和(自身を含む): 34974288

約数和(自身を除く): 13680309

約数列:

[1, 3, 7, 17, 21, 49, 51, 119, 147, 357, 833, 2499, 8521, 25563, 59647, 144857, 178941, 417529, 434571, 1013999, 1252587, 3041997, 7097993, 21293979]

約数ペア:

[(1, 21293979), (3, 7097993), (7, 3041997), (17, 1252587), (21, 1013999), (49, 434571), (51, 417529), (119, 178941), (147, 144857), (357, 59647), (833, 25563), (2499, 8521)]