21493143

素因数分解:

$3^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{53}}^1\times {\mathrm{157}}^1$

素因数の和:264

約数の個数: 48

約数和(自身を含む): 37267776

約数和(自身を除く): 15774633

約数列:

[1, 3, 7, 9, 21, 41, 53, 63, 123, 157, 159, 287, 369, 371, 471, 477, 861, 1099, 1113, 1413, 2173, 2583, 3297, 3339, 6437, 6519, 8321, 9891, 15211, 19311, 19557, 24963, 45059, 45633, 57933, 58247, 74889, 135177, 136899, 174741, 341161, 405531, 524223, 1023483, 2388127, 3070449, 7164381, 21493143]

約数ペア:

[(1, 21493143), (3, 7164381), (7, 3070449), (9, 2388127), (21, 1023483), (41, 524223), (53, 405531), (63, 341161), (123, 174741), (157, 136899), (159, 135177), (287, 74889), (369, 58247), (371, 57933), (471, 45633), (477, 45059), (861, 24963), (1099, 19557), (1113, 19311), (1413, 15211), (2173, 9891), (2583, 8321), (3297, 6519), (3339, 6437)]