20469760

素因数分解:

$2^{11}\times 5^1\times {\mathrm{1999}}^1$

素因数の和:2026

約数の個数: 48

約数和(自身を含む): 49140000

約数和(自身を除く): 28670240

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, 5120, 7996, 9995, 10240, 15992, 19990, 31984, 39980, 63968, 79960, 127936, 159920, 255872, 319840, 511744, 639680, 1023488, 1279360, 2046976, 2558720, 4093952, 5117440, 10234880, 20469760]

約数ペア:

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