20561920

素因数分解:

$2^{14}\times 5^1\times {\mathrm{251}}^1$

素因数の和:284

約数の個数: 60

約数和(自身を含む): 49543704

約数和(自身を除く): 28981784

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 251, 256, 320, 502, 512, 640, 1004, 1024, 1255, 1280, 2008, 2048, 2510, 2560, 4016, 4096, 5020, 5120, 8032, 8192, 10040, 10240, 16064, 16384, 20080, 20480, 32128, 40160, 40960, 64256, 80320, 81920, 128512, 160640, 257024, 321280, 514048, 642560, 1028096, 1285120, 2056192, 2570240, 4112384, 5140480, 10280960, 20561920]

約数ペア:

[(1, 20561920), (2, 10280960), (4, 5140480), (5, 4112384), (8, 2570240), (10, 2056192), (16, 1285120), (20, 1028096), (32, 642560), (40, 514048), (64, 321280), (80, 257024), (128, 160640), (160, 128512), (251, 81920), (256, 80320), (320, 64256), (502, 40960), (512, 40160), (640, 32128), (1004, 20480), (1024, 20080), (1255, 16384), (1280, 16064), (2008, 10240), (2048, 10040), (2510, 8192), (2560, 8032), (4016, 5120), (4096, 5020)]