21643349

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{557}}^1$

素因数の和:645

約数の個数: 24

約数和(自身を含む): 27607608

約数和(自身を除く): 5964259

約数列:

[1, 7, 13, 49, 61, 91, 427, 557, 637, 793, 2989, 3899, 5551, 7241, 27293, 33977, 38857, 50687, 237839, 354809, 441701, 1664873, 3091907, 21643349]

約数ペア:

[(1, 21643349), (7, 3091907), (13, 1664873), (49, 441701), (61, 354809), (91, 237839), (427, 50687), (557, 38857), (637, 33977), (793, 27293), (2989, 7241), (3899, 5551)]