20921085

素因数分解:

$3^5\times 5^1\times {\mathrm{67}}^1\times {\mathrm{257}}^1$

素因数の和:344

約数の個数: 48

約数和(自身を含む): 38316096

約数和(自身を除く): 17395011

約数列:

[1, 3, 5, 9, 15, 27, 45, 67, 81, 135, 201, 243, 257, 335, 405, 603, 771, 1005, 1215, 1285, 1809, 2313, 3015, 3855, 5427, 6939, 9045, 11565, 16281, 17219, 20817, 27135, 34695, 51657, 62451, 81405, 86095, 104085, 154971, 258285, 312255, 464913, 774855, 1394739, 2324565, 4184217, 6973695, 20921085]

約数ペア:

[(1, 20921085), (3, 6973695), (5, 4184217), (9, 2324565), (15, 1394739), (27, 774855), (45, 464913), (67, 312255), (81, 258285), (135, 154971), (201, 104085), (243, 86095), (257, 81405), (335, 62451), (405, 51657), (603, 34695), (771, 27135), (1005, 20817), (1215, 17219), (1285, 16281), (1809, 11565), (2313, 9045), (3015, 6939), (3855, 5427)]