21507265

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{409}}^1\times {\mathrm{809}}^1$

素因数の和:1236

約数の個数: 16

約数和(自身を含む): 27896400

約数和(自身を除く): 6389135

約数列:

[1, 5, 13, 65, 409, 809, 2045, 4045, 5317, 10517, 26585, 52585, 330881, 1654405, 4301453, 21507265]

約数ペア:

[(1, 21507265), (5, 4301453), (13, 1654405), (65, 330881), (409, 52585), (809, 26585), (2045, 10517), (4045, 5317)]