21269120

素因数分解:

$2^7\times 5^1\times {\mathrm{167}}^1\times {\mathrm{199}}^1$

素因数の和:385

約数の個数: 64

約数和(自身を含む): 51408000

約数和(自身を除く): 30138880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 167, 199, 320, 334, 398, 640, 668, 796, 835, 995, 1336, 1592, 1670, 1990, 2672, 3184, 3340, 3980, 5344, 6368, 6680, 7960, 10688, 12736, 13360, 15920, 21376, 25472, 26720, 31840, 33233, 53440, 63680, 66466, 106880, 127360, 132932, 166165, 265864, 332330, 531728, 664660, 1063456, 1329320, 2126912, 2658640, 4253824, 5317280, 10634560, 21269120]

約数ペア:

[(1, 21269120), (2, 10634560), (4, 5317280), (5, 4253824), (8, 2658640), (10, 2126912), (16, 1329320), (20, 1063456), (32, 664660), (40, 531728), (64, 332330), (80, 265864), (128, 166165), (160, 132932), (167, 127360), (199, 106880), (320, 66466), (334, 63680), (398, 53440), (640, 33233), (668, 31840), (796, 26720), (835, 25472), (995, 21376), (1336, 15920), (1592, 13360), (1670, 12736), (1990, 10688), (2672, 7960), (3184, 6680), (3340, 6368), (3980, 5344)]