20780788

素因数分解:

$2^2\times 7^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{269}}^1$

素因数の和:400

約数の個数: 48

約数和(自身を含む): 43545600

約数和(自身を除く): 22764812

約数列:

[1, 2, 4, 7, 14, 28, 31, 62, 89, 124, 178, 217, 269, 356, 434, 538, 623, 868, 1076, 1246, 1883, 2492, 2759, 3766, 5518, 7532, 8339, 11036, 16678, 19313, 23941, 33356, 38626, 47882, 58373, 77252, 95764, 116746, 167587, 233492, 335174, 670348, 742171, 1484342, 2968684, 5195197, 10390394, 20780788]

約数ペア:

[(1, 20780788), (2, 10390394), (4, 5195197), (7, 2968684), (14, 1484342), (28, 742171), (31, 670348), (62, 335174), (89, 233492), (124, 167587), (178, 116746), (217, 95764), (269, 77252), (356, 58373), (434, 47882), (538, 38626), (623, 33356), (868, 23941), (1076, 19313), (1246, 16678), (1883, 11036), (2492, 8339), (2759, 7532), (3766, 5518)]