20721008

素因数分解:

$2^4\times 7^1\times {\mathrm{11}}^3\times {\mathrm{139}}^1$

素因数の和:187

約数の個数: 80

約数和(自身を含む): 50830080

約数和(自身を除く): 30109072

約数列:

[1, 2, 4, 7, 8, 11, 14, 16, 22, 28, 44, 56, 77, 88, 112, 121, 139, 154, 176, 242, 278, 308, 484, 556, 616, 847, 968, 973, 1112, 1232, 1331, 1529, 1694, 1936, 1946, 2224, 2662, 3058, 3388, 3892, 5324, 6116, 6776, 7784, 9317, 10648, 10703, 12232, 13552, 15568, 16819, 18634, 21296, 21406, 24464, 33638, 37268, 42812, 67276, 74536, 85624, 117733, 134552, 149072, 171248, 185009, 235466, 269104, 370018, 470932, 740036, 941864, 1295063, 1480072, 1883728, 2590126, 2960144, 5180252, 10360504, 20721008]

約数ペア:

[(1, 20721008), (2, 10360504), (4, 5180252), (7, 2960144), (8, 2590126), (11, 1883728), (14, 1480072), (16, 1295063), (22, 941864), (28, 740036), (44, 470932), (56, 370018), (77, 269104), (88, 235466), (112, 185009), (121, 171248), (139, 149072), (154, 134552), (176, 117733), (242, 85624), (278, 74536), (308, 67276), (484, 42812), (556, 37268), (616, 33638), (847, 24464), (968, 21406), (973, 21296), (1112, 18634), (1232, 16819), (1331, 15568), (1529, 13552), (1694, 12232), (1936, 10703), (1946, 10648), (2224, 9317), (2662, 7784), (3058, 6776), (3388, 6116), (3892, 5324)]