21375680

素因数分解:

$2^6\times 5^1\times {\mathrm{67}}^1\times {\mathrm{997}}^1$

素因数の和:1081

約数の個数: 56

約数和(自身を含む): 51712368

約数和(自身を除く): 30336688

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 67, 80, 134, 160, 268, 320, 335, 536, 670, 997, 1072, 1340, 1994, 2144, 2680, 3988, 4288, 4985, 5360, 7976, 9970, 10720, 15952, 19940, 21440, 31904, 39880, 63808, 66799, 79760, 133598, 159520, 267196, 319040, 333995, 534392, 667990, 1068784, 1335980, 2137568, 2671960, 4275136, 5343920, 10687840, 21375680]

約数ペア:

[(1, 21375680), (2, 10687840), (4, 5343920), (5, 4275136), (8, 2671960), (10, 2137568), (16, 1335980), (20, 1068784), (32, 667990), (40, 534392), (64, 333995), (67, 319040), (80, 267196), (134, 159520), (160, 133598), (268, 79760), (320, 66799), (335, 63808), (536, 39880), (670, 31904), (997, 21440), (1072, 19940), (1340, 15952), (1994, 10720), (2144, 9970), (2680, 7976), (3988, 5360), (4288, 4985)]