21378591

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{163}}^1$

素因数の和:260

約数の個数: 48

約数和(自身を含む): 35817600

約数和(自身を除く): 14439009

約数列:

[1, 3, 9, 13, 19, 39, 57, 59, 117, 163, 171, 177, 247, 489, 531, 741, 767, 1121, 1467, 2119, 2223, 2301, 3097, 3363, 6357, 6903, 9291, 9617, 10089, 14573, 19071, 27873, 28851, 40261, 43719, 86553, 120783, 125021, 131157, 182723, 362349, 375063, 548169, 1125189, 1644507, 2375399, 7126197, 21378591]

約数ペア:

[(1, 21378591), (3, 7126197), (9, 2375399), (13, 1644507), (19, 1125189), (39, 548169), (57, 375063), (59, 362349), (117, 182723), (163, 131157), (171, 125021), (177, 120783), (247, 86553), (489, 43719), (531, 40261), (741, 28851), (767, 27873), (1121, 19071), (1467, 14573), (2119, 10089), (2223, 9617), (2301, 9291), (3097, 6903), (3363, 6357)]