20996404

素因数分解:

$2^2\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{71}}^1$

素因数の和:157

約数の個数: 72

約数和(自身を含む): 45045504

約数和(自身を除く): 24049100

約数列:

[1, 2, 4, 11, 13, 22, 26, 44, 47, 52, 71, 94, 121, 142, 143, 188, 242, 284, 286, 484, 517, 572, 611, 781, 923, 1034, 1222, 1562, 1573, 1846, 2068, 2444, 3124, 3146, 3337, 3692, 5687, 6292, 6674, 6721, 8591, 10153, 11374, 13348, 13442, 17182, 20306, 22748, 26884, 34364, 36707, 40612, 43381, 73414, 73931, 86762, 111683, 146828, 147862, 173524, 223366, 295724, 403777, 446732, 477191, 807554, 954382, 1615108, 1908764, 5249101, 10498202, 20996404]

約数ペア:

[(1, 20996404), (2, 10498202), (4, 5249101), (11, 1908764), (13, 1615108), (22, 954382), (26, 807554), (44, 477191), (47, 446732), (52, 403777), (71, 295724), (94, 223366), (121, 173524), (142, 147862), (143, 146828), (188, 111683), (242, 86762), (284, 73931), (286, 73414), (484, 43381), (517, 40612), (572, 36707), (611, 34364), (781, 26884), (923, 22748), (1034, 20306), (1222, 17182), (1562, 13442), (1573, 13348), (1846, 11374), (2068, 10153), (2444, 8591), (3124, 6721), (3146, 6674), (3337, 6292), (3692, 5687)]