21238371

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{1613}}^1$

素因数の和:1656

約数の個数: 48

約数和(自身を含む): 40285440

約数和(自身を除く): 19047069

約数列:

[1, 3, 7, 9, 11, 19, 21, 33, 57, 63, 77, 99, 133, 171, 209, 231, 399, 627, 693, 1197, 1463, 1613, 1881, 4389, 4839, 11291, 13167, 14517, 17743, 30647, 33873, 53229, 91941, 101619, 124201, 159687, 214529, 275823, 337117, 372603, 643587, 1011351, 1117809, 1930761, 2359819, 3034053, 7079457, 21238371]

約数ペア:

[(1, 21238371), (3, 7079457), (7, 3034053), (9, 2359819), (11, 1930761), (19, 1117809), (21, 1011351), (33, 643587), (57, 372603), (63, 337117), (77, 275823), (99, 214529), (133, 159687), (171, 124201), (209, 101619), (231, 91941), (399, 53229), (627, 33873), (693, 30647), (1197, 17743), (1463, 14517), (1613, 13167), (1881, 11291), (4389, 4839)]