21477987

素因数分解:

$3^3\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{641}}^1$

素因数の和:740

約数の個数: 32

約数和(自身を含む): 34205760

約数和(自身を除く): 12727773

約数列:

[1, 3, 9, 17, 27, 51, 73, 153, 219, 459, 641, 657, 1241, 1923, 1971, 3723, 5769, 10897, 11169, 17307, 32691, 33507, 46793, 98073, 140379, 294219, 421137, 795481, 1263411, 2386443, 7159329, 21477987]

約数ペア:

[(1, 21477987), (3, 7159329), (9, 2386443), (17, 1263411), (27, 795481), (51, 421137), (73, 294219), (153, 140379), (219, 98073), (459, 46793), (641, 33507), (657, 32691), (1241, 17307), (1923, 11169), (1971, 10897), (3723, 5769)]