21090705

素因数分解:

$3^1\times 5^1\times {\mathrm{257}}^1\times {\mathrm{5471}}^1$

素因数の和:5736

約数の個数: 16

約数和(自身を含む): 33882624

約数和(自身を除く): 12791919

約数列:

[1, 3, 5, 15, 257, 771, 1285, 3855, 5471, 16413, 27355, 82065, 1406047, 4218141, 7030235, 21090705]

約数ペア:

[(1, 21090705), (3, 7030235), (5, 4218141), (15, 1406047), (257, 82065), (771, 27355), (1285, 16413), (3855, 5471)]