21129775

素因数分解:

$5^2\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{431}}^1$

素因数の和:531

約数の個数: 24

約数和(自身を含む): 27480384

約数和(自身を除く): 6350609

約数列:

[1, 5, 25, 37, 53, 185, 265, 431, 925, 1325, 1961, 2155, 9805, 10775, 15947, 22843, 49025, 79735, 114215, 398675, 571075, 845191, 4225955, 21129775]

約数ペア:

[(1, 21129775), (5, 4225955), (25, 845191), (37, 571075), (53, 398675), (185, 114215), (265, 79735), (431, 49025), (925, 22843), (1325, 15947), (1961, 10775), (2155, 9805)]