21720664

素因数分解:

$2^3\times 7^1\times {\mathrm{397}}^1\times {\mathrm{977}}^1$

素因数の和:1387

約数の個数: 32

約数和(自身を含む): 46709280

約数和(自身を除く): 24988616

約数列:

[1, 2, 4, 7, 8, 14, 28, 56, 397, 794, 977, 1588, 1954, 2779, 3176, 3908, 5558, 6839, 7816, 11116, 13678, 22232, 27356, 54712, 387869, 775738, 1551476, 2715083, 3102952, 5430166, 10860332, 21720664]

約数ペア:

[(1, 21720664), (2, 10860332), (4, 5430166), (7, 3102952), (8, 2715083), (14, 1551476), (28, 775738), (56, 387869), (397, 54712), (794, 27356), (977, 22232), (1588, 13678), (1954, 11116), (2779, 7816), (3176, 6839), (3908, 5558)]