19801998

素因数分解:

$2^1\times 3^2\times {\mathrm{617}}^1\times {\mathrm{1783}}^1$

素因数の和:2408

約数の個数: 24

約数和(自身を含む): 42997968

約数和(自身を除く): 23195970

約数列:

[1, 2, 3, 6, 9, 18, 617, 1234, 1783, 1851, 3566, 3702, 5349, 5553, 10698, 11106, 16047, 32094, 1100111, 2200222, 3300333, 6600666, 9900999, 19801998]

約数ペア:

[(1, 19801998), (2, 9900999), (3, 6600666), (6, 3300333), (9, 2200222), (18, 1100111), (617, 32094), (1234, 16047), (1783, 11106), (1851, 10698), (3566, 5553), (3702, 5349)]