21218307

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{787}}^1$

素因数の和:863

約数の個数: 32

約数和(自身を含む): 33285120

約数和(自身を除く): 12066813

約数列:

[1, 3, 11, 19, 33, 43, 57, 129, 209, 473, 627, 787, 817, 1419, 2361, 2451, 8657, 8987, 14953, 25971, 26961, 33841, 44859, 101523, 164483, 372251, 493449, 642979, 1116753, 1928937, 7072769, 21218307]

約数ペア:

[(1, 21218307), (3, 7072769), (11, 1928937), (19, 1116753), (33, 642979), (43, 493449), (57, 372251), (129, 164483), (209, 101523), (473, 44859), (627, 33841), (787, 26961), (817, 25971), (1419, 14953), (2361, 8987), (2451, 8657)]