20991618

素因数分解:

$2^1\times 3^2\times {\mathrm{19}}^1\times {\mathrm{61379}}^1$

素因数の和:61406

約数の個数: 24

約数和(自身を含む): 47876400

約数和(自身を除く): 26884782

約数列:

[1, 2, 3, 6, 9, 18, 19, 38, 57, 114, 171, 342, 61379, 122758, 184137, 368274, 552411, 1104822, 1166201, 2332402, 3498603, 6997206, 10495809, 20991618]

約数ペア:

[(1, 20991618), (2, 10495809), (3, 6997206), (6, 3498603), (9, 2332402), (18, 1166201), (19, 1104822), (38, 552411), (57, 368274), (114, 184137), (171, 122758), (342, 61379)]