21139279

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{349}}^1\times {\mathrm{509}}^1$

素因数の和:882

約数の個数: 16

約数和(自身を含む): 25704000

約数和(自身を除く): 4564721

約数列:

[1, 7, 17, 119, 349, 509, 2443, 3563, 5933, 8653, 41531, 60571, 177641, 1243487, 3019897, 21139279]

約数ペア:

[(1, 21139279), (7, 3019897), (17, 1243487), (119, 177641), (349, 60571), (509, 41531), (2443, 8653), (3563, 5933)]