21969388

素因数分解:

$2^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{257}}^1$

素因数の和:382

約数の個数: 48

約数和(自身を含む): 45771264

約数和(自身を除く): 23801876

約数列:

[1, 2, 4, 7, 14, 28, 43, 71, 86, 142, 172, 257, 284, 301, 497, 514, 602, 994, 1028, 1204, 1799, 1988, 3053, 3598, 6106, 7196, 11051, 12212, 18247, 21371, 22102, 36494, 42742, 44204, 72988, 77357, 85484, 127729, 154714, 255458, 309428, 510916, 784621, 1569242, 3138484, 5492347, 10984694, 21969388]

約数ペア:

[(1, 21969388), (2, 10984694), (4, 5492347), (7, 3138484), (14, 1569242), (28, 784621), (43, 510916), (71, 309428), (86, 255458), (142, 154714), (172, 127729), (257, 85484), (284, 77357), (301, 72988), (497, 44204), (514, 42742), (602, 36494), (994, 22102), (1028, 21371), (1204, 18247), (1799, 12212), (1988, 11051), (3053, 7196), (3598, 6106)]