21812721

素因数分解:

$3^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{67}}^1\times {\mathrm{419}}^1$

素因数の和:533

約数の個数: 32

約数和(自身を含む): 34728960

約数和(自身を除く): 12916239

約数列:

[1, 3, 7, 21, 37, 67, 111, 201, 259, 419, 469, 777, 1257, 1407, 2479, 2933, 7437, 8799, 15503, 17353, 28073, 46509, 52059, 84219, 108521, 196511, 325563, 589533, 1038701, 3116103, 7270907, 21812721]

約数ペア:

[(1, 21812721), (3, 7270907), (7, 3116103), (21, 1038701), (37, 589533), (67, 325563), (111, 196511), (201, 108521), (259, 84219), (419, 52059), (469, 46509), (777, 28073), (1257, 17353), (1407, 15503), (2479, 8799), (2933, 7437)]