21520940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{347}}^1\times {\mathrm{443}}^1$

素因数の和:806

約数の個数: 48

約数和(自身を含む): 51916032

約数和(自身を除く): 30395092

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 347, 443, 694, 886, 1388, 1735, 1772, 2215, 2429, 3101, 3470, 4430, 4858, 6202, 6940, 8860, 9716, 12145, 12404, 15505, 24290, 31010, 48580, 62020, 153721, 307442, 614884, 768605, 1076047, 1537210, 2152094, 3074420, 4304188, 5380235, 10760470, 21520940]

約数ペア:

[(1, 21520940), (2, 10760470), (4, 5380235), (5, 4304188), (7, 3074420), (10, 2152094), (14, 1537210), (20, 1076047), (28, 768605), (35, 614884), (70, 307442), (140, 153721), (347, 62020), (443, 48580), (694, 31010), (886, 24290), (1388, 15505), (1735, 12404), (1772, 12145), (2215, 9716), (2429, 8860), (3101, 6940), (3470, 6202), (4430, 4858)]