21649551

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{149}}^1$

素因数の和:224

約数の個数: 64

約数和(自身を含む): 39398400

約数和(自身を除く): 17748849

約数列:

[1, 3, 7, 11, 17, 21, 33, 37, 51, 77, 111, 119, 149, 187, 231, 259, 357, 407, 447, 561, 629, 777, 1043, 1221, 1309, 1639, 1887, 2533, 2849, 3129, 3927, 4403, 4917, 5513, 6919, 7599, 8547, 11473, 13209, 16539, 17731, 20757, 27863, 34419, 38591, 48433, 53193, 60643, 83589, 93721, 115773, 145299, 181929, 195041, 281163, 424501, 585123, 656047, 1030931, 1273503, 1968141, 3092793, 7216517, 21649551]

約数ペア:

[(1, 21649551), (3, 7216517), (7, 3092793), (11, 1968141), (17, 1273503), (21, 1030931), (33, 656047), (37, 585123), (51, 424501), (77, 281163), (111, 195041), (119, 181929), (149, 145299), (187, 115773), (231, 93721), (259, 83589), (357, 60643), (407, 53193), (447, 48433), (561, 38591), (629, 34419), (777, 27863), (1043, 20757), (1221, 17731), (1309, 16539), (1639, 13209), (1887, 11473), (2533, 8547), (2849, 7599), (3129, 6919), (3927, 5513), (4403, 4917)]