21184640

素因数分解:

$2^7\times 5^1\times {\mathrm{79}}^1\times {\mathrm{419}}^1$

素因数の和:517

約数の個数: 64

約数和(自身を含む): 51408000

約数和(自身を除く): 30223360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 79, 80, 128, 158, 160, 316, 320, 395, 419, 632, 640, 790, 838, 1264, 1580, 1676, 2095, 2528, 3160, 3352, 4190, 5056, 6320, 6704, 8380, 10112, 12640, 13408, 16760, 25280, 26816, 33101, 33520, 50560, 53632, 66202, 67040, 132404, 134080, 165505, 264808, 268160, 331010, 529616, 662020, 1059232, 1324040, 2118464, 2648080, 4236928, 5296160, 10592320, 21184640]

約数ペア:

[(1, 21184640), (2, 10592320), (4, 5296160), (5, 4236928), (8, 2648080), (10, 2118464), (16, 1324040), (20, 1059232), (32, 662020), (40, 529616), (64, 331010), (79, 268160), (80, 264808), (128, 165505), (158, 134080), (160, 132404), (316, 67040), (320, 66202), (395, 53632), (419, 50560), (632, 33520), (640, 33101), (790, 26816), (838, 25280), (1264, 16760), (1580, 13408), (1676, 12640), (2095, 10112), (2528, 8380), (3160, 6704), (3352, 6320), (4190, 5056)]