21128390

素因数分解:

$2^1\times 5^1\times {\mathrm{73}}^1\times {\mathrm{103}}^1\times {\mathrm{281}}^1$

素因数の和:464

約数の個数: 32

約数和(自身を含む): 39064896

約数和(自身を除く): 17936506

約数列:

[1, 2, 5, 10, 73, 103, 146, 206, 281, 365, 515, 562, 730, 1030, 1405, 2810, 7519, 15038, 20513, 28943, 37595, 41026, 57886, 75190, 102565, 144715, 205130, 289430, 2112839, 4225678, 10564195, 21128390]

約数ペア:

[(1, 21128390), (2, 10564195), (5, 4225678), (10, 2112839), (73, 289430), (103, 205130), (146, 144715), (206, 102565), (281, 75190), (365, 57886), (515, 41026), (562, 37595), (730, 28943), (1030, 20513), (1405, 15038), (2810, 7519)]