21105981

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{383}}^1$

素因数の和:562

約数の個数: 32

約数和(自身を含む): 33976320

約数和(自身を除く): 12870339

約数列:

[1, 3, 9, 13, 27, 39, 117, 157, 351, 383, 471, 1149, 1413, 2041, 3447, 4239, 4979, 6123, 10341, 14937, 18369, 44811, 55107, 60131, 134433, 180393, 541179, 781703, 1623537, 2345109, 7035327, 21105981]

約数ペア:

[(1, 21105981), (3, 7035327), (9, 2345109), (13, 1623537), (27, 781703), (39, 541179), (117, 180393), (157, 134433), (351, 60131), (383, 55107), (471, 44811), (1149, 18369), (1413, 14937), (2041, 10341), (3447, 6123), (4239, 4979)]