21105819

素因数分解:

$3^3\times 7^3\times {\mathrm{43}}^1\times {\mathrm{53}}^1$

素因数の和:126

約数の個数: 64

約数和(自身を含む): 38016000

約数和(自身を除く): 16910181

約数列:

[1, 3, 7, 9, 21, 27, 43, 49, 53, 63, 129, 147, 159, 189, 301, 343, 371, 387, 441, 477, 903, 1029, 1113, 1161, 1323, 1431, 2107, 2279, 2597, 2709, 3087, 3339, 6321, 6837, 7791, 8127, 9261, 10017, 14749, 15953, 18179, 18963, 20511, 23373, 44247, 47859, 54537, 56889, 61533, 70119, 111671, 132741, 143577, 163611, 335013, 398223, 430731, 490833, 781697, 1005039, 2345091, 3015117, 7035273, 21105819]

約数ペア:

[(1, 21105819), (3, 7035273), (7, 3015117), (9, 2345091), (21, 1005039), (27, 781697), (43, 490833), (49, 430731), (53, 398223), (63, 335013), (129, 163611), (147, 143577), (159, 132741), (189, 111671), (301, 70119), (343, 61533), (371, 56889), (387, 54537), (441, 47859), (477, 44247), (903, 23373), (1029, 20511), (1113, 18963), (1161, 18179), (1323, 15953), (1431, 14749), (2107, 10017), (2279, 9261), (2597, 8127), (2709, 7791), (3087, 6837), (3339, 6321)]