21356853

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{67}}^1\times {\mathrm{353}}^1$

素因数の和:473

約数の個数: 32

約数和(自身を含む): 33893376

約数和(自身を除く): 12536523

約数列:

[1, 3, 7, 21, 43, 67, 129, 201, 301, 353, 469, 903, 1059, 1407, 2471, 2881, 7413, 8643, 15179, 20167, 23651, 45537, 60501, 70953, 106253, 165557, 318759, 496671, 1016993, 3050979, 7118951, 21356853]

約数ペア:

[(1, 21356853), (3, 7118951), (7, 3050979), (21, 1016993), (43, 496671), (67, 318759), (129, 165557), (201, 106253), (301, 70953), (353, 60501), (469, 45537), (903, 23651), (1059, 20167), (1407, 15179), (2471, 8643), (2881, 7413)]