20988968

素因数分解:

$2^3\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{2621}}^1$

素因数の和:2658

約数の個数: 64

約数和(自身を含む): 52859520

約数和(自身を除く): 31870552

約数列:

[1, 2, 4, 7, 8, 11, 13, 14, 22, 26, 28, 44, 52, 56, 77, 88, 91, 104, 143, 154, 182, 286, 308, 364, 572, 616, 728, 1001, 1144, 2002, 2621, 4004, 5242, 8008, 10484, 18347, 20968, 28831, 34073, 36694, 57662, 68146, 73388, 115324, 136292, 146776, 201817, 230648, 238511, 272584, 374803, 403634, 477022, 749606, 807268, 954044, 1499212, 1614536, 1908088, 2623621, 2998424, 5247242, 10494484, 20988968]

約数ペア:

[(1, 20988968), (2, 10494484), (4, 5247242), (7, 2998424), (8, 2623621), (11, 1908088), (13, 1614536), (14, 1499212), (22, 954044), (26, 807268), (28, 749606), (44, 477022), (52, 403634), (56, 374803), (77, 272584), (88, 238511), (91, 230648), (104, 201817), (143, 146776), (154, 136292), (182, 115324), (286, 73388), (308, 68146), (364, 57662), (572, 36694), (616, 34073), (728, 28831), (1001, 20968), (1144, 18347), (2002, 10484), (2621, 8008), (4004, 5242)]