1998940

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{1123}}^1$

素因数の和:1221

約数の個数: 24

約数和(自身を含む): 4248720

約数和(自身を除く): 2249780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1123, 1780, 2246, 4492, 5615, 11230, 22460, 99947, 199894, 399788, 499735, 999470, 1998940]

約数ペア:

[(1, 1998940), (2, 999470), (4, 499735), (5, 399788), (10, 199894), (20, 99947), (89, 22460), (178, 11230), (356, 5615), (445, 4492), (890, 2246), (1123, 1780)]