21539765

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{101}}^1\times {\mathrm{193}}^1$

素因数の和:329

約数の個数: 32

約数和(自身を含む): 29919456

約数和(自身を除く): 8379691

約数列:

[1, 5, 13, 17, 65, 85, 101, 193, 221, 505, 965, 1105, 1313, 1717, 2509, 3281, 6565, 8585, 12545, 16405, 19493, 22321, 42653, 97465, 111605, 213265, 253409, 331381, 1267045, 1656905, 4307953, 21539765]

約数ペア:

[(1, 21539765), (5, 4307953), (13, 1656905), (17, 1267045), (65, 331381), (85, 253409), (101, 213265), (193, 111605), (221, 97465), (505, 42653), (965, 22321), (1105, 19493), (1313, 16405), (1717, 12545), (2509, 8585), (3281, 6565)]