21000907991

素因数分解:

$7^3\times {\mathrm{53}}^1\times {\mathrm{139}}^1\times {\mathrm{8311}}^1$

素因数の和:8524

約数の個数: 32

約数和(自身を含む): 25135488000

約数和(自身を除く): 4134580009

約数列:

[1, 7, 49, 53, 139, 343, 371, 973, 2597, 6811, 7367, 8311, 18179, 47677, 51569, 58177, 360983, 407239, 440483, 1155229, 2526881, 2850673, 3083381, 8086603, 21583667, 56606221, 61227137, 151085669, 396243547, 428589959, 3000129713, 21000907991]

約数ペア:

[(1, 21000907991), (7, 3000129713), (49, 428589959), (53, 396243547), (139, 151085669), (343, 61227137), (371, 56606221), (973, 21583667), (2597, 8086603), (6811, 3083381), (7367, 2850673), (8311, 2526881), (18179, 1155229), (47677, 440483), (51569, 407239), (58177, 360983)]