21457737

素因数分解:

$3^3\times 7^4\times {\mathrm{331}}^1$

素因数の和:368

約数の個数: 40

約数和(自身を含む): 37197280

約数和(自身を除く): 15739543

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 147, 189, 331, 343, 441, 993, 1029, 1323, 2317, 2401, 2979, 3087, 6951, 7203, 8937, 9261, 16219, 20853, 21609, 48657, 62559, 64827, 113533, 145971, 340599, 437913, 794731, 1021797, 2384193, 3065391, 7152579, 21457737]

約数ペア:

[(1, 21457737), (3, 7152579), (7, 3065391), (9, 2384193), (21, 1021797), (27, 794731), (49, 437913), (63, 340599), (147, 145971), (189, 113533), (331, 64827), (343, 62559), (441, 48657), (993, 21609), (1029, 20853), (1323, 16219), (2317, 9261), (2401, 8937), (2979, 7203), (3087, 6951)]