21928137

素因数分解:

$3^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{191}}^1$

素因数の和:290

約数の個数: 48

約数和(自身を含む): 37822464

約数和(自身を除く): 15894327

約数列:

[1, 3, 7, 11, 21, 33, 49, 71, 77, 147, 191, 213, 231, 497, 539, 573, 781, 1337, 1491, 1617, 2101, 2343, 3479, 4011, 5467, 6303, 9359, 10437, 13561, 14707, 16401, 28077, 38269, 40683, 44121, 94927, 102949, 114807, 149171, 284781, 308847, 447513, 664489, 1044197, 1993467, 3132591, 7309379, 21928137]

約数ペア:

[(1, 21928137), (3, 7309379), (7, 3132591), (11, 1993467), (21, 1044197), (33, 664489), (49, 447513), (71, 308847), (77, 284781), (147, 149171), (191, 114807), (213, 102949), (231, 94927), (497, 44121), (539, 40683), (573, 38269), (781, 28077), (1337, 16401), (1491, 14707), (1617, 13561), (2101, 10437), (2343, 9359), (3479, 6303), (4011, 5467)]