21780745

素因数分解:

$5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{4679}}^1$

素因数の和:4717

約数の個数: 24

約数和(自身を含む): 32011200

約数和(自身を除く): 10230455

約数列:

[1, 5, 7, 19, 35, 49, 95, 133, 245, 665, 931, 4655, 4679, 23395, 32753, 88901, 163765, 229271, 444505, 622307, 1146355, 3111535, 4356149, 21780745]

約数ペア:

[(1, 21780745), (5, 4356149), (7, 3111535), (19, 1146355), (35, 622307), (49, 444505), (95, 229271), (133, 163765), (245, 88901), (665, 32753), (931, 23395), (4655, 4679)]