21248213

素因数分解:

$7^2\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{787}}^1$

素因数の和:849

約数の個数: 24

約数和(自身を含む): 26949600

約数和(自身を除く): 5701387

約数列:

[1, 7, 19, 29, 49, 133, 203, 551, 787, 931, 1421, 3857, 5509, 14953, 22823, 26999, 38563, 104671, 159761, 433637, 732697, 1118327, 3035459, 21248213]

約数ペア:

[(1, 21248213), (7, 3035459), (19, 1118327), (29, 732697), (49, 433637), (133, 159761), (203, 104671), (551, 38563), (787, 26999), (931, 22823), (1421, 14953), (3857, 5509)]