21580240

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{179}}^1$

素因数の和:340

約数の個数: 80

約数和(自身を含む): 55442880

約数和(自身を除く): 33862640

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 110, 137, 176, 179, 220, 274, 358, 440, 548, 685, 716, 880, 895, 1096, 1370, 1432, 1507, 1790, 1969, 2192, 2740, 2864, 3014, 3580, 3938, 5480, 6028, 7160, 7535, 7876, 9845, 10960, 12056, 14320, 15070, 15752, 19690, 24112, 24523, 30140, 31504, 39380, 49046, 60280, 78760, 98092, 120560, 122615, 157520, 196184, 245230, 269753, 392368, 490460, 539506, 980920, 1079012, 1348765, 1961840, 2158024, 2697530, 4316048, 5395060, 10790120, 21580240]

約数ペア:

[(1, 21580240), (2, 10790120), (4, 5395060), (5, 4316048), (8, 2697530), (10, 2158024), (11, 1961840), (16, 1348765), (20, 1079012), (22, 980920), (40, 539506), (44, 490460), (55, 392368), (80, 269753), (88, 245230), (110, 196184), (137, 157520), (176, 122615), (179, 120560), (220, 98092), (274, 78760), (358, 60280), (440, 49046), (548, 39380), (685, 31504), (716, 30140), (880, 24523), (895, 24112), (1096, 19690), (1370, 15752), (1432, 15070), (1507, 14320), (1790, 12056), (1969, 10960), (2192, 9845), (2740, 7876), (2864, 7535), (3014, 7160), (3580, 6028), (3938, 5480)]