19990720

素因数分解:

$2^6\times 5^1\times {\mathrm{179}}^1\times {\mathrm{349}}^1$

素因数の和:545

約数の個数: 56

約数和(自身を含む): 48006000

約数和(自身を除く): 28015280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 179, 320, 349, 358, 698, 716, 895, 1396, 1432, 1745, 1790, 2792, 2864, 3490, 3580, 5584, 5728, 6980, 7160, 11168, 11456, 13960, 14320, 22336, 27920, 28640, 55840, 57280, 62471, 111680, 124942, 249884, 312355, 499768, 624710, 999536, 1249420, 1999072, 2498840, 3998144, 4997680, 9995360, 19990720]

約数ペア:

[(1, 19990720), (2, 9995360), (4, 4997680), (5, 3998144), (8, 2498840), (10, 1999072), (16, 1249420), (20, 999536), (32, 624710), (40, 499768), (64, 312355), (80, 249884), (160, 124942), (179, 111680), (320, 62471), (349, 57280), (358, 55840), (698, 28640), (716, 27920), (895, 22336), (1396, 14320), (1432, 13960), (1745, 11456), (1790, 11168), (2792, 7160), (2864, 6980), (3490, 5728), (3580, 5584)]