21064407

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{131}}^1$

素因数の和:204

約数の個数: 64

約数和(自身を含む): 37847040

約数和(自身を除く): 16782633

約数列:

[1, 3, 7, 13, 19, 21, 31, 39, 57, 91, 93, 131, 133, 217, 247, 273, 393, 399, 403, 589, 651, 741, 917, 1209, 1703, 1729, 1767, 2489, 2751, 2821, 4061, 4123, 5109, 5187, 7467, 7657, 8463, 11921, 12183, 12369, 17423, 22971, 28427, 32357, 35763, 52269, 52793, 53599, 77159, 85281, 97071, 158379, 160797, 226499, 231477, 369551, 540113, 679497, 1003067, 1108653, 1620339, 3009201, 7021469, 21064407]

約数ペア:

[(1, 21064407), (3, 7021469), (7, 3009201), (13, 1620339), (19, 1108653), (21, 1003067), (31, 679497), (39, 540113), (57, 369551), (91, 231477), (93, 226499), (131, 160797), (133, 158379), (217, 97071), (247, 85281), (273, 77159), (393, 53599), (399, 52793), (403, 52269), (589, 35763), (651, 32357), (741, 28427), (917, 22971), (1209, 17423), (1703, 12369), (1729, 12183), (1767, 11921), (2489, 8463), (2751, 7657), (2821, 7467), (4061, 5187), (4123, 5109)]