21581872

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{127}}^1$

素因数の和:210

約数の個数: 80

約数和(自身を含む): 48885760

約数和(自身を除く): 27303888

約数列:

[1, 2, 4, 8, 13, 16, 19, 26, 38, 43, 52, 76, 86, 104, 127, 152, 172, 208, 247, 254, 304, 344, 494, 508, 559, 688, 817, 988, 1016, 1118, 1634, 1651, 1976, 2032, 2236, 2413, 3268, 3302, 3952, 4472, 4826, 5461, 6536, 6604, 8944, 9652, 10621, 10922, 13072, 13208, 19304, 21242, 21844, 26416, 31369, 38608, 42484, 43688, 62738, 70993, 84968, 87376, 103759, 125476, 141986, 169936, 207518, 250952, 283972, 415036, 501904, 567944, 830072, 1135888, 1348867, 1660144, 2697734, 5395468, 10790936, 21581872]

約数ペア:

[(1, 21581872), (2, 10790936), (4, 5395468), (8, 2697734), (13, 1660144), (16, 1348867), (19, 1135888), (26, 830072), (38, 567944), (43, 501904), (52, 415036), (76, 283972), (86, 250952), (104, 207518), (127, 169936), (152, 141986), (172, 125476), (208, 103759), (247, 87376), (254, 84968), (304, 70993), (344, 62738), (494, 43688), (508, 42484), (559, 38608), (688, 31369), (817, 26416), (988, 21844), (1016, 21242), (1118, 19304), (1634, 13208), (1651, 13072), (1976, 10922), (2032, 10621), (2236, 9652), (2413, 8944), (3268, 6604), (3302, 6536), (3952, 5461), (4472, 4826)]