20485780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{1117}}^1$

素因数の和:1264

約数の個数: 48

約数和(自身を含む): 49585536

約数和(自身を除く): 29099756

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 131, 140, 262, 524, 655, 917, 1117, 1310, 1834, 2234, 2620, 3668, 4468, 4585, 5585, 7819, 9170, 11170, 15638, 18340, 22340, 31276, 39095, 78190, 146327, 156380, 292654, 585308, 731635, 1024289, 1463270, 2048578, 2926540, 4097156, 5121445, 10242890, 20485780]

約数ペア:

[(1, 20485780), (2, 10242890), (4, 5121445), (5, 4097156), (7, 2926540), (10, 2048578), (14, 1463270), (20, 1024289), (28, 731635), (35, 585308), (70, 292654), (131, 156380), (140, 146327), (262, 78190), (524, 39095), (655, 31276), (917, 22340), (1117, 18340), (1310, 15638), (1834, 11170), (2234, 9170), (2620, 7819), (3668, 5585), (4468, 4585)]