21394779

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{43}}^2$

素因数の和:144

約数の個数: 48

約数和(自身を含む): 36345600

約数和(自身を除く): 14950821

約数列:

[1, 3, 7, 19, 21, 29, 43, 57, 87, 129, 133, 203, 301, 399, 551, 609, 817, 903, 1247, 1653, 1849, 2451, 3741, 3857, 5547, 5719, 8729, 11571, 12943, 17157, 23693, 26187, 35131, 38829, 53621, 71079, 105393, 160863, 165851, 245917, 375347, 497553, 737751, 1018799, 1126041, 3056397, 7131593, 21394779]

約数ペア:

[(1, 21394779), (3, 7131593), (7, 3056397), (19, 1126041), (21, 1018799), (29, 737751), (43, 497553), (57, 375347), (87, 245917), (129, 165851), (133, 160863), (203, 105393), (301, 71079), (399, 53621), (551, 38829), (609, 35131), (817, 26187), (903, 23693), (1247, 17157), (1653, 12943), (1849, 11571), (2451, 8729), (3741, 5719), (3857, 5547)]