21291909

素因数分解:

$3^1\times {\mathrm{37}}^1\times {\mathrm{433}}^1\times {\mathrm{443}}^1$

素因数の和:916

約数の個数: 16

約数和(自身を含む): 29289792

約数和(自身を除く): 7997883

約数列:

[1, 3, 37, 111, 433, 443, 1299, 1329, 16021, 16391, 48063, 49173, 191819, 575457, 7097303, 21291909]

約数ペア:

[(1, 21291909), (3, 7097303), (37, 575457), (111, 191819), (433, 49173), (443, 48063), (1299, 16391), (1329, 16021)]