81879040

素因数分解:

$2^{13}\times 5^1\times {\mathrm{1999}}^1$

素因数の和:2030

約数の個数: 56

約数和(自身を含む): 196596000

約数和(自身を除く): 114716960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 512, 640, 1024, 1280, 1999, 2048, 2560, 3998, 4096, 5120, 7996, 8192, 9995, 10240, 15992, 19990, 20480, 31984, 39980, 40960, 63968, 79960, 127936, 159920, 255872, 319840, 511744, 639680, 1023488, 1279360, 2046976, 2558720, 4093952, 5117440, 8187904, 10234880, 16375808, 20469760, 40939520, 81879040]

約数ペア:

[(1, 81879040), (2, 40939520), (4, 20469760), (5, 16375808), (8, 10234880), (10, 8187904), (16, 5117440), (20, 4093952), (32, 2558720), (40, 2046976), (64, 1279360), (80, 1023488), (128, 639680), (160, 511744), (256, 319840), (320, 255872), (512, 159920), (640, 127936), (1024, 79960), (1280, 63968), (1999, 40960), (2048, 39980), (2560, 31984), (3998, 20480), (4096, 19990), (5120, 15992), (7996, 10240), (8192, 9995)]