19980123

素因数分解:

$3^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{61}}^1\times {\mathrm{101}}^1$

素因数の和:235

約数の個数: 32

約数和(自身を含む): 29140992

約数和(自身を除く): 9160869

約数列:

[1, 3, 23, 47, 61, 69, 101, 141, 183, 303, 1081, 1403, 2323, 2867, 3243, 4209, 4747, 6161, 6969, 8601, 14241, 18483, 65941, 109181, 141703, 197823, 289567, 327543, 425109, 868701, 6660041, 19980123]

約数ペア:

[(1, 19980123), (3, 6660041), (23, 868701), (47, 425109), (61, 327543), (69, 289567), (101, 197823), (141, 141703), (183, 109181), (303, 65941), (1081, 18483), (1403, 14241), (2323, 8601), (2867, 6969), (3243, 6161), (4209, 4747)]