21000815

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{67}}^1\times {\mathrm{139}}^1$

素因数の和:263

約数の個数: 32

約数和(自身を含む): 28788480

約数和(自身を除く): 7787665

約数列:

[1, 5, 11, 41, 55, 67, 139, 205, 335, 451, 695, 737, 1529, 2255, 2747, 3685, 5699, 7645, 9313, 13735, 28495, 30217, 46565, 62689, 102443, 151085, 313445, 381833, 512215, 1909165, 4200163, 21000815]

約数ペア:

[(1, 21000815), (5, 4200163), (11, 1909165), (41, 512215), (55, 381833), (67, 313445), (139, 151085), (205, 102443), (335, 62689), (451, 46565), (695, 30217), (737, 28495), (1529, 13735), (2255, 9313), (2747, 7645), (3685, 5699)]