21005425

素因数分解:

$5^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{4139}}^1$

素因数の和:4185

約数の個数: 24

約数和(自身を含む): 30801600

約数和(自身を除く): 9796175

約数列:

[1, 5, 7, 25, 29, 35, 145, 175, 203, 725, 1015, 4139, 5075, 20695, 28973, 103475, 120031, 144865, 600155, 724325, 840217, 3000775, 4201085, 21005425]

約数ペア:

[(1, 21005425), (5, 4201085), (7, 3000775), (25, 840217), (29, 724325), (35, 600155), (145, 144865), (175, 120031), (203, 103475), (725, 28973), (1015, 20695), (4139, 5075)]