21042021

素因数分解:

$3^1\times 7^3\times {\mathrm{11}}^2\times {\mathrm{13}}^2$

素因数の和:72

約数の個数: 72

約数和(自身を含む): 38942400

約数和(自身を除く): 17900379

約数列:

[1, 3, 7, 11, 13, 21, 33, 39, 49, 77, 91, 121, 143, 147, 169, 231, 273, 343, 363, 429, 507, 539, 637, 847, 1001, 1029, 1183, 1573, 1617, 1859, 1911, 2541, 3003, 3549, 3773, 4459, 4719, 5577, 5929, 7007, 8281, 11011, 11319, 13013, 13377, 17787, 20449, 21021, 24843, 33033, 39039, 41503, 49049, 57967, 61347, 77077, 91091, 124509, 143143, 147147, 173901, 231231, 273273, 429429, 539539, 637637, 1002001, 1618617, 1912911, 3006003, 7014007, 21042021]

約数ペア:

[(1, 21042021), (3, 7014007), (7, 3006003), (11, 1912911), (13, 1618617), (21, 1002001), (33, 637637), (39, 539539), (49, 429429), (77, 273273), (91, 231231), (121, 173901), (143, 147147), (147, 143143), (169, 124509), (231, 91091), (273, 77077), (343, 61347), (363, 57967), (429, 49049), (507, 41503), (539, 39039), (637, 33033), (847, 24843), (1001, 21021), (1029, 20449), (1183, 17787), (1573, 13377), (1617, 13013), (1859, 11319), (1911, 11011), (2541, 8281), (3003, 7007), (3549, 5929), (3773, 5577), (4459, 4719)]