21509615

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{257}}^1\times {\mathrm{881}}^1$

素因数の和:1162

約数の個数: 16

約数和(自身を含む): 27306720

約数和(自身を除く): 5797105

約数列:

[1, 5, 19, 95, 257, 881, 1285, 4405, 4883, 16739, 24415, 83695, 226417, 1132085, 4301923, 21509615]

約数ペア:

[(1, 21509615), (5, 4301923), (19, 1132085), (95, 226417), (257, 83695), (881, 24415), (1285, 16739), (4405, 4883)]