20891860

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{89}}^1\times {\mathrm{97}}^1$

素因数の和:217

約数の個数: 72

約数和(自身を含む): 49268520

約数和(自身を除く): 28376660

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 89, 97, 110, 121, 178, 194, 220, 242, 356, 388, 445, 484, 485, 605, 890, 970, 979, 1067, 1210, 1780, 1940, 1958, 2134, 2420, 3916, 4268, 4895, 5335, 8633, 9790, 10670, 10769, 11737, 17266, 19580, 21340, 21538, 23474, 34532, 43076, 43165, 46948, 53845, 58685, 86330, 94963, 107690, 117370, 172660, 189926, 215380, 234740, 379852, 474815, 949630, 1044593, 1899260, 2089186, 4178372, 5222965, 10445930, 20891860]

約数ペア:

[(1, 20891860), (2, 10445930), (4, 5222965), (5, 4178372), (10, 2089186), (11, 1899260), (20, 1044593), (22, 949630), (44, 474815), (55, 379852), (89, 234740), (97, 215380), (110, 189926), (121, 172660), (178, 117370), (194, 107690), (220, 94963), (242, 86330), (356, 58685), (388, 53845), (445, 46948), (484, 43165), (485, 43076), (605, 34532), (890, 23474), (970, 21538), (979, 21340), (1067, 19580), (1210, 17266), (1780, 11737), (1940, 10769), (1958, 10670), (2134, 9790), (2420, 8633), (3916, 5335), (4268, 4895)]