21389907

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{103}}^1$

素因数の和:184

約数の個数: 64

約数和(自身を含む): 38338560

約数和(自身を除く): 16948653

約数列:

[1, 3, 7, 11, 21, 29, 31, 33, 77, 87, 93, 103, 203, 217, 231, 309, 319, 341, 609, 651, 721, 899, 957, 1023, 1133, 2163, 2233, 2387, 2697, 2987, 3193, 3399, 6293, 6699, 7161, 7931, 8961, 9579, 9889, 18879, 20909, 22351, 23793, 29667, 32857, 35123, 62727, 67053, 69223, 92597, 98571, 105369, 207669, 229999, 245861, 277791, 648179, 689997, 737583, 1018567, 1944537, 3055701, 7129969, 21389907]

約数ペア:

[(1, 21389907), (3, 7129969), (7, 3055701), (11, 1944537), (21, 1018567), (29, 737583), (31, 689997), (33, 648179), (77, 277791), (87, 245861), (93, 229999), (103, 207669), (203, 105369), (217, 98571), (231, 92597), (309, 69223), (319, 67053), (341, 62727), (609, 35123), (651, 32857), (721, 29667), (899, 23793), (957, 22351), (1023, 20909), (1133, 18879), (2163, 9889), (2233, 9579), (2387, 8961), (2697, 7931), (2987, 7161), (3193, 6699), (3399, 6293)]