21987693

素因数分解:

$3^4\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{157}}^1$

素因数の和:208

約数の個数: 80

約数和(自身を含む): 42824320

約数和(自身を除く): 20836627

約数列:

[1, 3, 7, 9, 13, 19, 21, 27, 39, 57, 63, 81, 91, 117, 133, 157, 171, 189, 247, 273, 351, 399, 471, 513, 567, 741, 819, 1053, 1099, 1197, 1413, 1539, 1729, 2041, 2223, 2457, 2983, 3297, 3591, 4239, 5187, 6123, 6669, 7371, 8949, 9891, 10773, 12717, 14287, 15561, 18369, 20007, 20881, 26847, 29673, 38779, 42861, 46683, 55107, 62643, 80541, 89019, 116337, 128583, 140049, 165321, 187929, 241623, 271453, 349011, 385749, 563787, 814359, 1047033, 1157247, 1691361, 2443077, 3141099, 7329231, 21987693]

約数ペア:

[(1, 21987693), (3, 7329231), (7, 3141099), (9, 2443077), (13, 1691361), (19, 1157247), (21, 1047033), (27, 814359), (39, 563787), (57, 385749), (63, 349011), (81, 271453), (91, 241623), (117, 187929), (133, 165321), (157, 140049), (171, 128583), (189, 116337), (247, 89019), (273, 80541), (351, 62643), (399, 55107), (471, 46683), (513, 42861), (567, 38779), (741, 29673), (819, 26847), (1053, 20881), (1099, 20007), (1197, 18369), (1413, 15561), (1539, 14287), (1729, 12717), (2041, 10773), (2223, 9891), (2457, 8949), (2983, 7371), (3297, 6669), (3591, 6123), (4239, 5187)]