21378695

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{4909}}^1$

素因数の和:4994

約数の個数: 16

約数和(自身を含む): 28045920

約数和(自身を除く): 6667225

約数列:

[1, 5, 13, 65, 67, 335, 871, 4355, 4909, 24545, 63817, 319085, 328903, 1644515, 4275739, 21378695]

約数ペア:

[(1, 21378695), (5, 4275739), (13, 1644515), (65, 328903), (67, 319085), (335, 63817), (871, 24545), (4355, 4909)]