21439640

素因数分解:

$2^3\times 5^1\times {\mathrm{535991}}^1$

素因数の和:536002

約数の個数: 16

約数和(自身を含む): 48239280

約数和(自身を除く): 26799640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 535991, 1071982, 2143964, 2679955, 4287928, 5359910, 10719820, 21439640]

約数ペア:

[(1, 21439640), (2, 10719820), (4, 5359910), (5, 4287928), (8, 2679955), (10, 2143964), (20, 1071982), (40, 535991)]