21395997

素因数分解:

$3^2\times 7^3\times {\mathrm{29}}^1\times {\mathrm{239}}^1$

素因数の和:295

約数の個数: 48

約数和(自身を含む): 37440000

約数和(自身を除く): 16044003

約数列:

[1, 3, 7, 9, 21, 29, 49, 63, 87, 147, 203, 239, 261, 343, 441, 609, 717, 1029, 1421, 1673, 1827, 2151, 3087, 4263, 5019, 6931, 9947, 11711, 12789, 15057, 20793, 29841, 35133, 48517, 62379, 81977, 89523, 105399, 145551, 245931, 339619, 436653, 737793, 1018857, 2377333, 3056571, 7131999, 21395997]

約数ペア:

[(1, 21395997), (3, 7131999), (7, 3056571), (9, 2377333), (21, 1018857), (29, 737793), (49, 436653), (63, 339619), (87, 245931), (147, 145551), (203, 105399), (239, 89523), (261, 81977), (343, 62379), (441, 48517), (609, 35133), (717, 29841), (1029, 20793), (1421, 15057), (1673, 12789), (1827, 11711), (2151, 9947), (3087, 6931), (4263, 5019)]