20987795

素因数分解:

$5^1\times {\mathrm{83}}^1\times {\mathrm{103}}^1\times {\mathrm{491}}^1$

素因数の和:682

約数の個数: 16

約数和(自身を含む): 25788672

約数和(自身を除く): 4800877

約数列:

[1, 5, 83, 103, 415, 491, 515, 2455, 8549, 40753, 42745, 50573, 203765, 252865, 4197559, 20987795]

約数ペア:

[(1, 20987795), (5, 4197559), (83, 252865), (103, 203765), (415, 50573), (491, 42745), (515, 40753), (2455, 8549)]