21387125

素因数分解:

$5^3\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{173}}^1$

素因数の和:254

約数の個数: 32

約数和(自身を含む): 28664064

約数和(自身を除く): 7276939

約数列:

[1, 5, 23, 25, 43, 115, 125, 173, 215, 575, 865, 989, 1075, 2875, 3979, 4325, 4945, 5375, 7439, 19895, 21625, 24725, 37195, 99475, 123625, 171097, 185975, 497375, 855485, 929875, 4277425, 21387125]

約数ペア:

[(1, 21387125), (5, 4277425), (23, 929875), (25, 855485), (43, 497375), (115, 185975), (125, 171097), (173, 123625), (215, 99475), (575, 37195), (865, 24725), (989, 21625), (1075, 19895), (2875, 7439), (3979, 5375), (4325, 4945)]