18991240

素因数分解:

$2^3\times 5^1\times {\mathrm{167}}^1\times {\mathrm{2843}}^1$

素因数の和:3021

約数の個数: 32

約数和(自身を含む): 43001280

約数和(自身を除く): 24010040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 167, 334, 668, 835, 1336, 1670, 2843, 3340, 5686, 6680, 11372, 14215, 22744, 28430, 56860, 113720, 474781, 949562, 1899124, 2373905, 3798248, 4747810, 9495620, 18991240]

約数ペア:

[(1, 18991240), (2, 9495620), (4, 4747810), (5, 3798248), (8, 2373905), (10, 1899124), (20, 949562), (40, 474781), (167, 113720), (334, 56860), (668, 28430), (835, 22744), (1336, 14215), (1670, 11372), (2843, 6680), (3340, 5686)]