21129405

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{3461}}^1$

素因数の和:3517

約数の個数: 32

約数和(自身を含む): 37888128

約数和(自身を除く): 16758723

約数列:

[1, 3, 5, 11, 15, 33, 37, 55, 111, 165, 185, 407, 555, 1221, 2035, 3461, 6105, 10383, 17305, 38071, 51915, 114213, 128057, 190355, 384171, 571065, 640285, 1408627, 1920855, 4225881, 7043135, 21129405]

約数ペア:

[(1, 21129405), (3, 7043135), (5, 4225881), (11, 1920855), (15, 1408627), (33, 640285), (37, 571065), (55, 384171), (111, 190355), (165, 128057), (185, 114213), (407, 51915), (555, 38071), (1221, 17305), (2035, 10383), (3461, 6105)]