21991431

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{83}}^1$

素因数の和:172

約数の個数: 64

約数和(自身を含む): 39223296

約数和(自身を除く): 17231865

約数列:

[1, 3, 7, 11, 21, 31, 33, 37, 77, 83, 93, 111, 217, 231, 249, 259, 341, 407, 581, 651, 777, 913, 1023, 1147, 1221, 1743, 2387, 2573, 2739, 2849, 3071, 3441, 6391, 7161, 7719, 8029, 8547, 9213, 12617, 18011, 19173, 21497, 24087, 28303, 33781, 37851, 54033, 64491, 84909, 88319, 95201, 101343, 198121, 236467, 264957, 285603, 594363, 666407, 709401, 1047211, 1999221, 3141633, 7330477, 21991431]

約数ペア:

[(1, 21991431), (3, 7330477), (7, 3141633), (11, 1999221), (21, 1047211), (31, 709401), (33, 666407), (37, 594363), (77, 285603), (83, 264957), (93, 236467), (111, 198121), (217, 101343), (231, 95201), (249, 88319), (259, 84909), (341, 64491), (407, 54033), (581, 37851), (651, 33781), (777, 28303), (913, 24087), (1023, 21497), (1147, 19173), (1221, 18011), (1743, 12617), (2387, 9213), (2573, 8547), (2739, 8029), (2849, 7719), (3071, 7161), (3441, 6391)]