21312640

素因数分解:

$2^7\times 5^1\times {\mathrm{33301}}^1$

素因数の和:33320

約数の個数: 32

約数和(自身を含む): 50952060

約数和(自身を除く): 29639420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 33301, 66602, 133204, 166505, 266408, 333010, 532816, 666020, 1065632, 1332040, 2131264, 2664080, 4262528, 5328160, 10656320, 21312640]

約数ペア:

[(1, 21312640), (2, 10656320), (4, 5328160), (5, 4262528), (8, 2664080), (10, 2131264), (16, 1332040), (20, 1065632), (32, 666020), (40, 532816), (64, 333010), (80, 266408), (128, 166505), (160, 133204), (320, 66602), (640, 33301)]