21397173

素因数分解:

$3^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{163}}^1$

素因数の和:246

約数の個数: 48

約数和(自身を含む): 35896320

約数和(自身を除く): 14499147

約数列:

[1, 3, 7, 19, 21, 47, 49, 57, 133, 141, 147, 163, 329, 399, 489, 893, 931, 987, 1141, 2303, 2679, 2793, 3097, 3423, 6251, 6909, 7661, 7987, 9291, 18753, 21679, 22983, 23961, 43757, 53627, 65037, 131271, 145559, 151753, 160881, 375389, 436677, 455259, 1018913, 1126167, 3056739, 7132391, 21397173]

約数ペア:

[(1, 21397173), (3, 7132391), (7, 3056739), (19, 1126167), (21, 1018913), (47, 455259), (49, 436677), (57, 375389), (133, 160881), (141, 151753), (147, 145559), (163, 131271), (329, 65037), (399, 53627), (489, 43757), (893, 23961), (931, 22983), (987, 21679), (1141, 18753), (2303, 9291), (2679, 7987), (2793, 7661), (3097, 6909), (3423, 6251)]