21123156957

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{157}}^1\times {\mathrm{449}}^1\times {\mathrm{751}}^1$

素因数の和:1386

約数の個数: 64

約数和(自身を含む): 34219008000

約数和(自身を除く): 13095851043

約数列:

[1, 3, 7, 19, 21, 57, 133, 157, 399, 449, 471, 751, 1099, 1347, 2253, 2983, 3143, 3297, 5257, 8531, 8949, 9429, 14269, 15771, 20881, 25593, 42807, 59717, 62643, 70493, 99883, 117907, 179151, 211479, 299649, 337199, 353721, 493451, 825349, 1011597, 1339367, 1480353, 2240233, 2360393, 2476047, 4018101, 6406781, 6720699, 7081179, 9375569, 15681631, 19220343, 28126707, 44847467, 47044893, 52940243, 134542401, 158820729, 370581701, 1005864617, 1111745103, 3017593851, 7041052319, 21123156957]

約数ペア:

[(1, 21123156957), (3, 7041052319), (7, 3017593851), (19, 1111745103), (21, 1005864617), (57, 370581701), (133, 158820729), (157, 134542401), (399, 52940243), (449, 47044893), (471, 44847467), (751, 28126707), (1099, 19220343), (1347, 15681631), (2253, 9375569), (2983, 7081179), (3143, 6720699), (3297, 6406781), (5257, 4018101), (8531, 2476047), (8949, 2360393), (9429, 2240233), (14269, 1480353), (15771, 1339367), (20881, 1011597), (25593, 825349), (42807, 493451), (59717, 353721), (62643, 337199), (70493, 299649), (99883, 211479), (117907, 179151)]