21254768

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{139}}^1\times {\mathrm{503}}^1$

素因数の和:669

約数の個数: 40

約数和(自身を含む): 43747200

約数和(自身を除く): 22492432

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 139, 152, 278, 304, 503, 556, 1006, 1112, 2012, 2224, 2641, 4024, 5282, 8048, 9557, 10564, 19114, 21128, 38228, 42256, 69917, 76456, 139834, 152912, 279668, 559336, 1118672, 1328423, 2656846, 5313692, 10627384, 21254768]

約数ペア:

[(1, 21254768), (2, 10627384), (4, 5313692), (8, 2656846), (16, 1328423), (19, 1118672), (38, 559336), (76, 279668), (139, 152912), (152, 139834), (278, 76456), (304, 69917), (503, 42256), (556, 38228), (1006, 21128), (1112, 19114), (2012, 10564), (2224, 9557), (2641, 8048), (4024, 5282)]