21456904

素因数分解:

$2^3\times 7^2\times {\mathrm{127}}^1\times {\mathrm{431}}^1$

素因数の和:578

約数の個数: 48

約数和(自身を含む): 47278080

約数和(自身を除く): 25821176

約数列:

[1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 127, 196, 254, 392, 431, 508, 862, 889, 1016, 1724, 1778, 3017, 3448, 3556, 6034, 6223, 7112, 12068, 12446, 21119, 24136, 24892, 42238, 49784, 54737, 84476, 109474, 168952, 218948, 383159, 437896, 766318, 1532636, 2682113, 3065272, 5364226, 10728452, 21456904]

約数ペア:

[(1, 21456904), (2, 10728452), (4, 5364226), (7, 3065272), (8, 2682113), (14, 1532636), (28, 766318), (49, 437896), (56, 383159), (98, 218948), (127, 168952), (196, 109474), (254, 84476), (392, 54737), (431, 49784), (508, 42238), (862, 24892), (889, 24136), (1016, 21119), (1724, 12446), (1778, 12068), (3017, 7112), (3448, 6223), (3556, 6034)]