21249640

素因数分解:

$2^3\times 5^1\times {\mathrm{47}}^1\times {\mathrm{89}}^1\times {\mathrm{127}}^1$

素因数の和:274

約数の個数: 64

約数和(自身を含む): 49766400

約数和(自身を除く): 28516760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 47, 89, 94, 127, 178, 188, 235, 254, 356, 376, 445, 470, 508, 635, 712, 890, 940, 1016, 1270, 1780, 1880, 2540, 3560, 4183, 5080, 5969, 8366, 11303, 11938, 16732, 20915, 22606, 23876, 29845, 33464, 41830, 45212, 47752, 56515, 59690, 83660, 90424, 113030, 119380, 167320, 226060, 238760, 452120, 531241, 1062482, 2124964, 2656205, 4249928, 5312410, 10624820, 21249640]

約数ペア:

[(1, 21249640), (2, 10624820), (4, 5312410), (5, 4249928), (8, 2656205), (10, 2124964), (20, 1062482), (40, 531241), (47, 452120), (89, 238760), (94, 226060), (127, 167320), (178, 119380), (188, 113030), (235, 90424), (254, 83660), (356, 59690), (376, 56515), (445, 47752), (470, 45212), (508, 41830), (635, 33464), (712, 29845), (890, 23876), (940, 22606), (1016, 20915), (1270, 16732), (1780, 11938), (1880, 11303), (2540, 8366), (3560, 5969), (4183, 5080)]