21257559

素因数分解:

$3^4\times {\mathrm{67}}^1\times {\mathrm{3917}}^1$

素因数の和:3996

約数の個数: 20

約数和(自身を含む): 32237304

約数和(自身を除く): 10979745

約数列:

[1, 3, 9, 27, 67, 81, 201, 603, 1809, 3917, 5427, 11751, 35253, 105759, 262439, 317277, 787317, 2361951, 7085853, 21257559]

約数ペア:

[(1, 21257559), (3, 7085853), (9, 2361951), (27, 787317), (67, 317277), (81, 262439), (201, 105759), (603, 35253), (1809, 11751), (3917, 5427)]