18438987

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{1249}}^1$

素因数の和:1315

約数の個数: 32

約数和(自身を含む): 30400000

約数和(自身を除く): 11961013

約数列:

[1, 3, 7, 19, 21, 37, 57, 111, 133, 259, 399, 703, 777, 1249, 2109, 3747, 4921, 8743, 14763, 23731, 26229, 46213, 71193, 138639, 166117, 323491, 498351, 878047, 970473, 2634141, 6146329, 18438987]

約数ペア:

[(1, 18438987), (3, 6146329), (7, 2634141), (19, 970473), (21, 878047), (37, 498351), (57, 323491), (111, 166117), (133, 138639), (259, 71193), (399, 46213), (703, 26229), (777, 23731), (1249, 14763), (2109, 8743), (3747, 4921)]