638990720

素因数分解:

$2^7\times 5^1\times {\mathrm{998423}}^1$

素因数の和:998442

約数の個数: 32

約数和(自身を含む): 1527588720

約数和(自身を除く): 888598000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 998423, 1996846, 3993692, 4992115, 7987384, 9984230, 15974768, 19968460, 31949536, 39936920, 63899072, 79873840, 127798144, 159747680, 319495360, 638990720]

約数ペア:

[(1, 638990720), (2, 319495360), (4, 159747680), (5, 127798144), (8, 79873840), (10, 63899072), (16, 39936920), (20, 31949536), (32, 19968460), (40, 15974768), (64, 9984230), (80, 7987384), (128, 4992115), (160, 3993692), (320, 1996846), (640, 998423)]