21977956

素因数分解:

$2^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{499}}^1$

素因数の和:545

約数の個数: 72

約数和(自身を含む): 52136000

約数和(自身を除く): 30158044

約数列:

[1, 2, 4, 7, 11, 13, 14, 22, 26, 28, 44, 52, 77, 91, 121, 143, 154, 182, 242, 286, 308, 364, 484, 499, 572, 847, 998, 1001, 1573, 1694, 1996, 2002, 3146, 3388, 3493, 4004, 5489, 6292, 6487, 6986, 10978, 11011, 12974, 13972, 21956, 22022, 25948, 38423, 44044, 45409, 60379, 71357, 76846, 90818, 120758, 142714, 153692, 181636, 241516, 285428, 422653, 499499, 784927, 845306, 998998, 1569854, 1690612, 1997996, 3139708, 5494489, 10988978, 21977956]

約数ペア:

[(1, 21977956), (2, 10988978), (4, 5494489), (7, 3139708), (11, 1997996), (13, 1690612), (14, 1569854), (22, 998998), (26, 845306), (28, 784927), (44, 499499), (52, 422653), (77, 285428), (91, 241516), (121, 181636), (143, 153692), (154, 142714), (182, 120758), (242, 90818), (286, 76846), (308, 71357), (364, 60379), (484, 45409), (499, 44044), (572, 38423), (847, 25948), (998, 22022), (1001, 21956), (1573, 13972), (1694, 12974), (1996, 11011), (2002, 10978), (3146, 6986), (3388, 6487), (3493, 6292), (4004, 5489)]