21605780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{97}}^1$

素因数の和:193

約数の個数: 96

約数和(自身を含む): 55055616

約数和(自身を除く): 33449836

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 37, 43, 70, 74, 86, 97, 140, 148, 172, 185, 194, 215, 259, 301, 370, 388, 430, 485, 518, 602, 679, 740, 860, 970, 1036, 1204, 1295, 1358, 1505, 1591, 1940, 2590, 2716, 3010, 3182, 3395, 3589, 4171, 5180, 6020, 6364, 6790, 7178, 7955, 8342, 11137, 13580, 14356, 15910, 16684, 17945, 20855, 22274, 25123, 29197, 31820, 35890, 41710, 44548, 50246, 55685, 58394, 71780, 83420, 100492, 111370, 116788, 125615, 145985, 154327, 222740, 251230, 291970, 308654, 502460, 583940, 617308, 771635, 1080289, 1543270, 2160578, 3086540, 4321156, 5401445, 10802890, 21605780]

約数ペア:

[(1, 21605780), (2, 10802890), (4, 5401445), (5, 4321156), (7, 3086540), (10, 2160578), (14, 1543270), (20, 1080289), (28, 771635), (35, 617308), (37, 583940), (43, 502460), (70, 308654), (74, 291970), (86, 251230), (97, 222740), (140, 154327), (148, 145985), (172, 125615), (185, 116788), (194, 111370), (215, 100492), (259, 83420), (301, 71780), (370, 58394), (388, 55685), (430, 50246), (485, 44548), (518, 41710), (602, 35890), (679, 31820), (740, 29197), (860, 25123), (970, 22274), (1036, 20855), (1204, 17945), (1295, 16684), (1358, 15910), (1505, 14356), (1591, 13580), (1940, 11137), (2590, 8342), (2716, 7955), (3010, 7178), (3182, 6790), (3395, 6364), (3589, 6020), (4171, 5180)]