20721920

素因数分解:

$2^8\times 5^1\times {\mathrm{16189}}^1$

素因数の和:16210

約数の個数: 36

約数和(自身を含む): 49638540

約数和(自身を除く): 28916620

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 1280, 16189, 32378, 64756, 80945, 129512, 161890, 259024, 323780, 518048, 647560, 1036096, 1295120, 2072192, 2590240, 4144384, 5180480, 10360960, 20721920]

約数ペア:

[(1, 20721920), (2, 10360960), (4, 5180480), (5, 4144384), (8, 2590240), (10, 2072192), (16, 1295120), (20, 1036096), (32, 647560), (40, 518048), (64, 323780), (80, 259024), (128, 161890), (160, 129512), (256, 80945), (320, 64756), (640, 32378), (1280, 16189)]