21551805

素因数分解:

$3^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{631}}^1$

素因数の和:679

約数の個数: 64

約数和(自身を含む): 43683840

約数和(自身を除く): 22132035

約数列:

[1, 3, 5, 9, 11, 15, 23, 27, 33, 45, 55, 69, 99, 115, 135, 165, 207, 253, 297, 345, 495, 621, 631, 759, 1035, 1265, 1485, 1893, 2277, 3105, 3155, 3795, 5679, 6831, 6941, 9465, 11385, 14513, 17037, 20823, 28395, 34155, 34705, 43539, 62469, 72565, 85185, 104115, 130617, 159643, 187407, 217695, 312345, 391851, 478929, 653085, 798215, 937035, 1436787, 1959255, 2394645, 4310361, 7183935, 21551805]

約数ペア:

[(1, 21551805), (3, 7183935), (5, 4310361), (9, 2394645), (11, 1959255), (15, 1436787), (23, 937035), (27, 798215), (33, 653085), (45, 478929), (55, 391851), (69, 312345), (99, 217695), (115, 187407), (135, 159643), (165, 130617), (207, 104115), (253, 85185), (297, 72565), (345, 62469), (495, 43539), (621, 34705), (631, 34155), (759, 28395), (1035, 20823), (1265, 17037), (1485, 14513), (1893, 11385), (2277, 9465), (3105, 6941), (3155, 6831), (3795, 5679)]