21471957

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{743}}^1$

素因数の和:794

約数の個数: 36

約数和(自身を含む): 35399520

約数和(自身を除く): 13927563

約数列:

[1, 3, 9, 13, 19, 39, 57, 117, 169, 171, 247, 507, 741, 743, 1521, 2223, 2229, 3211, 6687, 9633, 9659, 14117, 28899, 28977, 42351, 86931, 125567, 127053, 183521, 376701, 550563, 1130103, 1651689, 2385773, 7157319, 21471957]

約数ペア:

[(1, 21471957), (3, 7157319), (9, 2385773), (13, 1651689), (19, 1130103), (39, 550563), (57, 376701), (117, 183521), (169, 127053), (171, 125567), (247, 86931), (507, 42351), (741, 28977), (743, 28899), (1521, 14117), (2223, 9659), (2229, 9633), (3211, 6687)]