21509691

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1$

素因数の和:144

約数の個数: 64

約数和(自身を含む): 37355520

約数和(自身を除く): 15845829

約数列:

[1, 3, 7, 19, 21, 31, 37, 47, 57, 93, 111, 133, 141, 217, 259, 329, 399, 589, 651, 703, 777, 893, 987, 1147, 1457, 1739, 1767, 2109, 2679, 3441, 4123, 4371, 4921, 5217, 6251, 8029, 10199, 12173, 12369, 14763, 18753, 21793, 24087, 27683, 30597, 33041, 36519, 53909, 65379, 83049, 99123, 152551, 161727, 193781, 231287, 377363, 457653, 581343, 693861, 1024271, 1132089, 3072813, 7169897, 21509691]

約数ペア:

[(1, 21509691), (3, 7169897), (7, 3072813), (19, 1132089), (21, 1024271), (31, 693861), (37, 581343), (47, 457653), (57, 377363), (93, 231287), (111, 193781), (133, 161727), (141, 152551), (217, 99123), (259, 83049), (329, 65379), (399, 53909), (589, 36519), (651, 33041), (703, 30597), (777, 27683), (893, 24087), (987, 21793), (1147, 18753), (1457, 14763), (1739, 12369), (1767, 12173), (2109, 10199), (2679, 8029), (3441, 6251), (4123, 5217), (4371, 4921)]