21257768

素因数分解:

$2^3\times 7^3\times {\mathrm{61}}^1\times {\mathrm{127}}^1$

素因数の和:215

約数の個数: 64

約数和(自身を含む): 47616000

約数和(自身を除く): 26358232

約数列:

[1, 2, 4, 7, 8, 14, 28, 49, 56, 61, 98, 122, 127, 196, 244, 254, 343, 392, 427, 488, 508, 686, 854, 889, 1016, 1372, 1708, 1778, 2744, 2989, 3416, 3556, 5978, 6223, 7112, 7747, 11956, 12446, 15494, 20923, 23912, 24892, 30988, 41846, 43561, 49784, 54229, 61976, 83692, 87122, 108458, 167384, 174244, 216916, 348488, 379603, 433832, 759206, 1518412, 2657221, 3036824, 5314442, 10628884, 21257768]

約数ペア:

[(1, 21257768), (2, 10628884), (4, 5314442), (7, 3036824), (8, 2657221), (14, 1518412), (28, 759206), (49, 433832), (56, 379603), (61, 348488), (98, 216916), (122, 174244), (127, 167384), (196, 108458), (244, 87122), (254, 83692), (343, 61976), (392, 54229), (427, 49784), (488, 43561), (508, 41846), (686, 30988), (854, 24892), (889, 23912), (1016, 20923), (1372, 15494), (1708, 12446), (1778, 11956), (2744, 7747), (2989, 7112), (3416, 6223), (3556, 5978)]