18900040

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{5309}}^1$

素因数の和:5409

約数の個数: 32

約数和(自身を含む): 43011000

約数和(自身を除く): 24110960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 178, 356, 445, 712, 890, 1780, 3560, 5309, 10618, 21236, 26545, 42472, 53090, 106180, 212360, 472501, 945002, 1890004, 2362505, 3780008, 4725010, 9450020, 18900040]

約数ペア:

[(1, 18900040), (2, 9450020), (4, 4725010), (5, 3780008), (8, 2362505), (10, 1890004), (20, 945002), (40, 472501), (89, 212360), (178, 106180), (356, 53090), (445, 42472), (712, 26545), (890, 21236), (1780, 10618), (3560, 5309)]