21691971

素因数分解:

$3^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{383}}^1$

素因数の和:456

約数の個数: 48

約数和(自身を含む): 38338560

約数和(自身を除く): 16646589

約数列:

[1, 3, 7, 9, 21, 29, 31, 63, 87, 93, 203, 217, 261, 279, 383, 609, 651, 899, 1149, 1827, 1953, 2681, 2697, 3447, 6293, 8043, 8091, 11107, 11873, 18879, 24129, 33321, 35619, 56637, 77749, 83111, 99963, 106857, 233247, 249333, 344317, 699741, 747999, 1032951, 2410219, 3098853, 7230657, 21691971]

約数ペア:

[(1, 21691971), (3, 7230657), (7, 3098853), (9, 2410219), (21, 1032951), (29, 747999), (31, 699741), (63, 344317), (87, 249333), (93, 233247), (203, 106857), (217, 99963), (261, 83111), (279, 77749), (383, 56637), (609, 35619), (651, 33321), (899, 24129), (1149, 18879), (1827, 11873), (1953, 11107), (2681, 8091), (2697, 8043), (3447, 6293)]