20439040

素因数分解:

$2^{13}\times 5^1\times {\mathrm{499}}^1$

素因数の和:530

約数の個数: 56

約数和(自身を含む): 49149000

約数和(自身を除く): 28709960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 499, 512, 640, 998, 1024, 1280, 1996, 2048, 2495, 2560, 3992, 4096, 4990, 5120, 7984, 8192, 9980, 10240, 15968, 19960, 20480, 31936, 39920, 40960, 63872, 79840, 127744, 159680, 255488, 319360, 510976, 638720, 1021952, 1277440, 2043904, 2554880, 4087808, 5109760, 10219520, 20439040]

約数ペア:

[(1, 20439040), (2, 10219520), (4, 5109760), (5, 4087808), (8, 2554880), (10, 2043904), (16, 1277440), (20, 1021952), (32, 638720), (40, 510976), (64, 319360), (80, 255488), (128, 159680), (160, 127744), (256, 79840), (320, 63872), (499, 40960), (512, 39920), (640, 31936), (998, 20480), (1024, 19960), (1280, 15968), (1996, 10240), (2048, 9980), (2495, 8192), (2560, 7984), (3992, 5120), (4096, 4990)]