20971251

素因数分解:

$3^3\times 7^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{107}}^1$

素因数の和:201

約数の個数: 64

約数和(自身を含む): 38568960

約数和(自身を除く): 17597709

約数列:

[1, 3, 7, 9, 17, 21, 27, 51, 61, 63, 107, 119, 153, 183, 189, 321, 357, 427, 459, 549, 749, 963, 1037, 1071, 1281, 1647, 1819, 2247, 2889, 3111, 3213, 3843, 5457, 6527, 6741, 7259, 9333, 11529, 12733, 16371, 19581, 20223, 21777, 27999, 38199, 45689, 49113, 58743, 65331, 110959, 114597, 137067, 176229, 195993, 332877, 343791, 411201, 776713, 998631, 1233603, 2330139, 2995893, 6990417, 20971251]

約数ペア:

[(1, 20971251), (3, 6990417), (7, 2995893), (9, 2330139), (17, 1233603), (21, 998631), (27, 776713), (51, 411201), (61, 343791), (63, 332877), (107, 195993), (119, 176229), (153, 137067), (183, 114597), (189, 110959), (321, 65331), (357, 58743), (427, 49113), (459, 45689), (549, 38199), (749, 27999), (963, 21777), (1037, 20223), (1071, 19581), (1281, 16371), (1647, 12733), (1819, 11529), (2247, 9333), (2889, 7259), (3111, 6741), (3213, 6527), (3843, 5457)]