21487725

素因数分解:

$3^2\times 5^2\times 7^2\times {\mathrm{1949}}^1$

素因数の和:1979

約数の個数: 54

約数和(自身を含む): 44793450

約数和(自身を除く): 23305725

約数列:

[1, 3, 5, 7, 9, 15, 21, 25, 35, 45, 49, 63, 75, 105, 147, 175, 225, 245, 315, 441, 525, 735, 1225, 1575, 1949, 2205, 3675, 5847, 9745, 11025, 13643, 17541, 29235, 40929, 48725, 68215, 87705, 95501, 122787, 146175, 204645, 286503, 341075, 438525, 477505, 613935, 859509, 1023225, 1432515, 2387525, 3069675, 4297545, 7162575, 21487725]

約数ペア:

[(1, 21487725), (3, 7162575), (5, 4297545), (7, 3069675), (9, 2387525), (15, 1432515), (21, 1023225), (25, 859509), (35, 613935), (45, 477505), (49, 438525), (63, 341075), (75, 286503), (105, 204645), (147, 146175), (175, 122787), (225, 95501), (245, 87705), (315, 68215), (441, 48725), (525, 40929), (735, 29235), (1225, 17541), (1575, 13643), (1949, 11025), (2205, 9745), (3675, 5847)]