21780453

素因数分解:

$3^1\times {\mathrm{131}}^1\times {\mathrm{157}}^1\times {\mathrm{353}}^1$

素因数の和:644

約数の個数: 16

約数和(自身を含む): 29532096

約数和(自身を除く): 7751643

約数列:

[1, 3, 131, 157, 353, 393, 471, 1059, 20567, 46243, 55421, 61701, 138729, 166263, 7260151, 21780453]

約数ペア:

[(1, 21780453), (3, 7260151), (131, 166263), (157, 138729), (353, 61701), (393, 55421), (471, 46243), (1059, 20567)]