21391216

素因数分解:

$2^4\times 7^1\times {\mathrm{11}}^1\times {\mathrm{97}}^1\times {\mathrm{179}}^1$

素因数の和:302

約数の個数: 80

約数和(自身を含む): 52496640

約数和(自身を除く): 31105424

約数列:

[1, 2, 4, 7, 8, 11, 14, 16, 22, 28, 44, 56, 77, 88, 97, 112, 154, 176, 179, 194, 308, 358, 388, 616, 679, 716, 776, 1067, 1232, 1253, 1358, 1432, 1552, 1969, 2134, 2506, 2716, 2864, 3938, 4268, 5012, 5432, 7469, 7876, 8536, 10024, 10864, 13783, 14938, 15752, 17072, 17363, 20048, 27566, 29876, 31504, 34726, 55132, 59752, 69452, 110264, 119504, 121541, 138904, 190993, 220528, 243082, 277808, 381986, 486164, 763972, 972328, 1336951, 1527944, 1944656, 2673902, 3055888, 5347804, 10695608, 21391216]

約数ペア:

[(1, 21391216), (2, 10695608), (4, 5347804), (7, 3055888), (8, 2673902), (11, 1944656), (14, 1527944), (16, 1336951), (22, 972328), (28, 763972), (44, 486164), (56, 381986), (77, 277808), (88, 243082), (97, 220528), (112, 190993), (154, 138904), (176, 121541), (179, 119504), (194, 110264), (308, 69452), (358, 59752), (388, 55132), (616, 34726), (679, 31504), (716, 29876), (776, 27566), (1067, 20048), (1232, 17363), (1253, 17072), (1358, 15752), (1432, 14938), (1552, 13783), (1969, 10864), (2134, 10024), (2506, 8536), (2716, 7876), (2864, 7469), (3938, 5432), (4268, 5012)]