20989325

素因数分解:

$5^2\times 7^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{73}}^1$

素因数の和:174

約数の個数: 48

約数和(自身を含む): 31712256

約数和(自身を除く): 10722931

約数列:

[1, 5, 7, 25, 31, 35, 53, 73, 155, 175, 217, 265, 365, 371, 511, 775, 1085, 1325, 1643, 1825, 1855, 2263, 2555, 3869, 5425, 8215, 9275, 11315, 11501, 12775, 15841, 19345, 27083, 41075, 56575, 57505, 79205, 96725, 119939, 135415, 287525, 396025, 599695, 677075, 839573, 2998475, 4197865, 20989325]

約数ペア:

[(1, 20989325), (5, 4197865), (7, 2998475), (25, 839573), (31, 677075), (35, 599695), (53, 396025), (73, 287525), (155, 135415), (175, 119939), (217, 96725), (265, 79205), (365, 57505), (371, 56575), (511, 41075), (775, 27083), (1085, 19345), (1325, 15841), (1643, 12775), (1825, 11501), (1855, 11315), (2263, 9275), (2555, 8215), (3869, 5425)]