21371920

素因数分解:

$2^4\times 5^1\times {\mathrm{311}}^1\times {\mathrm{859}}^1$

素因数の和:1183

約数の個数: 40

約数和(自身を含む): 49907520

約数和(自身を除く): 28535600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 311, 622, 859, 1244, 1555, 1718, 2488, 3110, 3436, 4295, 4976, 6220, 6872, 8590, 12440, 13744, 17180, 24880, 34360, 68720, 267149, 534298, 1068596, 1335745, 2137192, 2671490, 4274384, 5342980, 10685960, 21371920]

約数ペア:

[(1, 21371920), (2, 10685960), (4, 5342980), (5, 4274384), (8, 2671490), (10, 2137192), (16, 1335745), (20, 1068596), (40, 534298), (80, 267149), (311, 68720), (622, 34360), (859, 24880), (1244, 17180), (1555, 13744), (1718, 12440), (2488, 8590), (3110, 6872), (3436, 6220), (4295, 4976)]