21997507

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{89}}^1$

素因数の和:211

約数の個数: 32

約数和(自身を含む): 28200960

約数和(自身を除く): 6203453

約数列:

[1, 7, 17, 31, 67, 89, 119, 217, 469, 527, 623, 1139, 1513, 2077, 2759, 3689, 5963, 7973, 10591, 14539, 19313, 35309, 41741, 46903, 101371, 184853, 247163, 328321, 709597, 1293971, 3142501, 21997507]

約数ペア:

[(1, 21997507), (7, 3142501), (17, 1293971), (31, 709597), (67, 328321), (89, 247163), (119, 184853), (217, 101371), (469, 46903), (527, 41741), (623, 35309), (1139, 19313), (1513, 14539), (2077, 10591), (2759, 7973), (3689, 5963)]