28191121

素因数分解:

$7^2\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{277}}^1$

素因数の和:389

約数の個数: 24

約数和(自身を含む): 34480896

約数和(自身を除く): 6289775

約数列:

[1, 7, 31, 49, 67, 217, 277, 469, 1519, 1939, 2077, 3283, 8587, 13573, 14539, 18559, 60109, 101773, 129913, 420763, 575329, 909391, 4027303, 28191121]

約数ペア:

[(1, 28191121), (7, 4027303), (31, 909391), (49, 575329), (67, 420763), (217, 129913), (277, 101773), (469, 60109), (1519, 18559), (1939, 14539), (2077, 13573), (3283, 8587)]