20684800

素因数分解:

$2^{13}\times 5^2\times {\mathrm{101}}^1$

素因数の和:137

約数の個数: 84

約数和(自身を含む): 51803046

約数和(自身を除く): 31118246

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 101, 128, 160, 200, 202, 256, 320, 400, 404, 505, 512, 640, 800, 808, 1010, 1024, 1280, 1600, 1616, 2020, 2048, 2525, 2560, 3200, 3232, 4040, 4096, 5050, 5120, 6400, 6464, 8080, 8192, 10100, 10240, 12800, 12928, 16160, 20200, 20480, 25600, 25856, 32320, 40400, 40960, 51200, 51712, 64640, 80800, 102400, 103424, 129280, 161600, 204800, 206848, 258560, 323200, 413696, 517120, 646400, 827392, 1034240, 1292800, 2068480, 2585600, 4136960, 5171200, 10342400, 20684800]

約数ペア:

[(1, 20684800), (2, 10342400), (4, 5171200), (5, 4136960), (8, 2585600), (10, 2068480), (16, 1292800), (20, 1034240), (25, 827392), (32, 646400), (40, 517120), (50, 413696), (64, 323200), (80, 258560), (100, 206848), (101, 204800), (128, 161600), (160, 129280), (200, 103424), (202, 102400), (256, 80800), (320, 64640), (400, 51712), (404, 51200), (505, 40960), (512, 40400), (640, 32320), (800, 25856), (808, 25600), (1010, 20480), (1024, 20200), (1280, 16160), (1600, 12928), (1616, 12800), (2020, 10240), (2048, 10100), (2525, 8192), (2560, 8080), (3200, 6464), (3232, 6400), (4040, 5120), (4096, 5050)]