21397857

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{431}}^1$

素因数の和:533

約数の個数: 32

約数和(自身を含む): 32901120

約数和(自身を除く): 11503263

約数列:

[1, 3, 13, 19, 39, 57, 67, 201, 247, 431, 741, 871, 1273, 1293, 2613, 3819, 5603, 8189, 16549, 16809, 24567, 28877, 49647, 86631, 106457, 319371, 375401, 548663, 1126203, 1645989, 7132619, 21397857]

約数ペア:

[(1, 21397857), (3, 7132619), (13, 1645989), (19, 1126203), (39, 548663), (57, 375401), (67, 319371), (201, 106457), (247, 86631), (431, 49647), (741, 28877), (871, 24567), (1273, 16809), (1293, 16549), (2613, 8189), (3819, 5603)]