20487760

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{3607}}^1$

素因数の和:3691

約数の個数: 40

約数和(自身を含む): 48318336

約数和(自身を除く): 27830576

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 142, 284, 355, 568, 710, 1136, 1420, 2840, 3607, 5680, 7214, 14428, 18035, 28856, 36070, 57712, 72140, 144280, 256097, 288560, 512194, 1024388, 1280485, 2048776, 2560970, 4097552, 5121940, 10243880, 20487760]

約数ペア:

[(1, 20487760), (2, 10243880), (4, 5121940), (5, 4097552), (8, 2560970), (10, 2048776), (16, 1280485), (20, 1024388), (40, 512194), (71, 288560), (80, 256097), (142, 144280), (284, 72140), (355, 57712), (568, 36070), (710, 28856), (1136, 18035), (1420, 14428), (2840, 7214), (3607, 5680)]