21220725

素因数分解:

$3^1\times 5^2\times {\mathrm{523}}^1\times {\mathrm{541}}^1$

素因数の和:1077

約数の個数: 24

約数和(自身を含む): 35216992

約数和(自身を除く): 13996267

約数列:

[1, 3, 5, 15, 25, 75, 523, 541, 1569, 1623, 2615, 2705, 7845, 8115, 13075, 13525, 39225, 40575, 282943, 848829, 1414715, 4244145, 7073575, 21220725]

約数ペア:

[(1, 21220725), (3, 7073575), (5, 4244145), (15, 1414715), (25, 848829), (75, 282943), (523, 40575), (541, 39225), (1569, 13525), (1623, 13075), (2615, 8115), (2705, 7845)]