21205767

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{1091}}^1$

素因数の和:1155

約数の個数: 32

約数和(自身を含む): 33546240

約数和(自身を除く): 12340473

約数列:

[1, 3, 11, 19, 31, 33, 57, 93, 209, 341, 589, 627, 1023, 1091, 1767, 3273, 6479, 12001, 19437, 20729, 33821, 36003, 62187, 101463, 228019, 372031, 642599, 684057, 1116093, 1927797, 7068589, 21205767]

約数ペア:

[(1, 21205767), (3, 7068589), (11, 1927797), (19, 1116093), (31, 684057), (33, 642599), (57, 372031), (93, 228019), (209, 101463), (341, 62187), (589, 36003), (627, 33821), (1023, 20729), (1091, 19437), (1767, 12001), (3273, 6479)]