20502040

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{443}}^1$

素因数の和:556

約数の個数: 64

約数和(自身を含む): 50349600

約数和(自身を除く): 29847560

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 89, 104, 130, 178, 260, 356, 443, 445, 520, 712, 886, 890, 1157, 1772, 1780, 2215, 2314, 3544, 3560, 4430, 4628, 5759, 5785, 8860, 9256, 11518, 11570, 17720, 23036, 23140, 28795, 39427, 46072, 46280, 57590, 78854, 115180, 157708, 197135, 230360, 315416, 394270, 512551, 788540, 1025102, 1577080, 2050204, 2562755, 4100408, 5125510, 10251020, 20502040]

約数ペア:

[(1, 20502040), (2, 10251020), (4, 5125510), (5, 4100408), (8, 2562755), (10, 2050204), (13, 1577080), (20, 1025102), (26, 788540), (40, 512551), (52, 394270), (65, 315416), (89, 230360), (104, 197135), (130, 157708), (178, 115180), (260, 78854), (356, 57590), (443, 46280), (445, 46072), (520, 39427), (712, 28795), (886, 23140), (890, 23036), (1157, 17720), (1772, 11570), (1780, 11518), (2215, 9256), (2314, 8860), (3544, 5785), (3560, 5759), (4430, 4628)]