21991949

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{41}}^1\times {\mathrm{109}}^1$

素因数の和:213

約数の個数: 32

約数和(自身を含む): 28089600

約数和(自身を除く): 6097651

約数列:

[1, 7, 19, 37, 41, 109, 133, 259, 287, 703, 763, 779, 1517, 2071, 4033, 4469, 4921, 5453, 10619, 14497, 28231, 28823, 31283, 76627, 84911, 165353, 201761, 536389, 594377, 1157471, 3141707, 21991949]

約数ペア:

[(1, 21991949), (7, 3141707), (19, 1157471), (37, 594377), (41, 536389), (109, 201761), (133, 165353), (259, 84911), (287, 76627), (703, 31283), (763, 28823), (779, 28231), (1517, 14497), (2071, 10619), (4033, 5453), (4469, 4921)]