20985237

素因数分解:

$3^5\times 7^1\times {\mathrm{13}}^2\times {\mathrm{73}}^1$

素因数の和:121

約数の個数: 72

約数和(自身を含む): 39434304

約数和(自身を除く): 18449067

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 63, 73, 81, 91, 117, 169, 189, 219, 243, 273, 351, 507, 511, 567, 657, 819, 949, 1053, 1183, 1521, 1533, 1701, 1971, 2457, 2847, 3159, 3549, 4563, 4599, 5913, 6643, 7371, 8541, 10647, 12337, 13689, 13797, 17739, 19929, 22113, 25623, 31941, 37011, 41067, 41391, 59787, 76869, 86359, 95823, 111033, 124173, 179361, 230607, 259077, 287469, 333099, 538083, 777231, 999297, 1614249, 2331693, 2997891, 6995079, 20985237]

約数ペア:

[(1, 20985237), (3, 6995079), (7, 2997891), (9, 2331693), (13, 1614249), (21, 999297), (27, 777231), (39, 538083), (63, 333099), (73, 287469), (81, 259077), (91, 230607), (117, 179361), (169, 124173), (189, 111033), (219, 95823), (243, 86359), (273, 76869), (351, 59787), (507, 41391), (511, 41067), (567, 37011), (657, 31941), (819, 25623), (949, 22113), (1053, 19929), (1183, 17739), (1521, 13797), (1533, 13689), (1701, 12337), (1971, 10647), (2457, 8541), (2847, 7371), (3159, 6643), (3549, 5913), (4563, 4599)]