19961721

素因数分解:

$3^5\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:188

約数の個数: 48

約数和(自身を含む): 33022080

約数和(自身を除く): 13060359

約数列:

[1, 3, 9, 13, 27, 39, 71, 81, 89, 117, 213, 243, 267, 351, 639, 801, 923, 1053, 1157, 1917, 2403, 2769, 3159, 3471, 5751, 6319, 7209, 8307, 10413, 17253, 18957, 21627, 24921, 31239, 56871, 74763, 82147, 93717, 170613, 224289, 246441, 281151, 511839, 739323, 1535517, 2217969, 6653907, 19961721]

約数ペア:

[(1, 19961721), (3, 6653907), (9, 2217969), (13, 1535517), (27, 739323), (39, 511839), (71, 281151), (81, 246441), (89, 224289), (117, 170613), (213, 93717), (243, 82147), (267, 74763), (351, 56871), (639, 31239), (801, 24921), (923, 21627), (1053, 18957), (1157, 17253), (1917, 10413), (2403, 8307), (2769, 7209), (3159, 6319), (3471, 5751)]