21319881

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{919}}^1$

素因数の和:989

約数の個数: 32

約数和(自身を含む): 33561600

約数和(自身を除く): 12241719

約数列:

[1, 3, 11, 19, 33, 37, 57, 111, 209, 407, 627, 703, 919, 1221, 2109, 2757, 7733, 10109, 17461, 23199, 30327, 34003, 52383, 102009, 192071, 374033, 576213, 646057, 1122099, 1938171, 7106627, 21319881]

約数ペア:

[(1, 21319881), (3, 7106627), (11, 1938171), (19, 1122099), (33, 646057), (37, 576213), (57, 374033), (111, 192071), (209, 102009), (407, 52383), (627, 34003), (703, 30327), (919, 23199), (1221, 17461), (2109, 10109), (2757, 7733)]