21289515

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{2539}}^1$

素因数の和:2603

約数の個数: 32

約数和(自身を含む): 37551360

約数和(自身を除く): 16261845

約数列:

[1, 3, 5, 13, 15, 39, 43, 65, 129, 195, 215, 559, 645, 1677, 2539, 2795, 7617, 8385, 12695, 33007, 38085, 99021, 109177, 165035, 327531, 495105, 545885, 1419301, 1637655, 4257903, 7096505, 21289515]

約数ペア:

[(1, 21289515), (3, 7096505), (5, 4257903), (13, 1637655), (15, 1419301), (39, 545885), (43, 495105), (65, 327531), (129, 165035), (195, 109177), (215, 99021), (559, 38085), (645, 33007), (1677, 12695), (2539, 8385), (2795, 7617)]