21131385

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{83}}^1\times {\mathrm{1543}}^1$

素因数の和:1645

約数の個数: 32

約数和(自身を含む): 37352448

約数和(自身を除く): 16221063

約数列:

[1, 3, 5, 11, 15, 33, 55, 83, 165, 249, 415, 913, 1245, 1543, 2739, 4565, 4629, 7715, 13695, 16973, 23145, 50919, 84865, 128069, 254595, 384207, 640345, 1408759, 1921035, 4226277, 7043795, 21131385]

約数ペア:

[(1, 21131385), (3, 7043795), (5, 4226277), (11, 1921035), (15, 1408759), (33, 640345), (55, 384207), (83, 254595), (165, 128069), (249, 84865), (415, 50919), (913, 23145), (1245, 16973), (1543, 13695), (2739, 7715), (4565, 4629)]