21428660

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{257}}^1\times {\mathrm{379}}^1$

素因数の和:656

約数の個数: 48

約数和(自身を含む): 49412160

約数和(自身を除く): 27983500

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 257, 379, 514, 758, 1028, 1285, 1516, 1895, 2570, 2827, 3790, 4169, 5140, 5654, 7580, 8338, 11308, 14135, 16676, 20845, 28270, 41690, 56540, 83380, 97403, 194806, 389612, 487015, 974030, 1071433, 1948060, 2142866, 4285732, 5357165, 10714330, 21428660]

約数ペア:

[(1, 21428660), (2, 10714330), (4, 5357165), (5, 4285732), (10, 2142866), (11, 1948060), (20, 1071433), (22, 974030), (44, 487015), (55, 389612), (110, 194806), (220, 97403), (257, 83380), (379, 56540), (514, 41690), (758, 28270), (1028, 20845), (1285, 16676), (1516, 14135), (1895, 11308), (2570, 8338), (2827, 7580), (3790, 5654), (4169, 5140)]