21265280

素因数分解:

$2^7\times 5^1\times {\mathrm{149}}^1\times {\mathrm{223}}^1$

素因数の和:391

約数の個数: 64

約数和(自身を含む): 51408000

約数和(自身を除く): 30142720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 149, 160, 223, 298, 320, 446, 596, 640, 745, 892, 1115, 1192, 1490, 1784, 2230, 2384, 2980, 3568, 4460, 4768, 5960, 7136, 8920, 9536, 11920, 14272, 17840, 19072, 23840, 28544, 33227, 35680, 47680, 66454, 71360, 95360, 132908, 142720, 166135, 265816, 332270, 531632, 664540, 1063264, 1329080, 2126528, 2658160, 4253056, 5316320, 10632640, 21265280]

約数ペア:

[(1, 21265280), (2, 10632640), (4, 5316320), (5, 4253056), (8, 2658160), (10, 2126528), (16, 1329080), (20, 1063264), (32, 664540), (40, 531632), (64, 332270), (80, 265816), (128, 166135), (149, 142720), (160, 132908), (223, 95360), (298, 71360), (320, 66454), (446, 47680), (596, 35680), (640, 33227), (745, 28544), (892, 23840), (1115, 19072), (1192, 17840), (1490, 14272), (1784, 11920), (2230, 9536), (2384, 8920), (2980, 7136), (3568, 5960), (4460, 4768)]