20640640

素因数分解:

$2^7\times 5^1\times {\mathrm{32251}}^1$

素因数の和:32270

約数の個数: 32

約数和(自身を含む): 49345560

約数和(自身を除く): 28704920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 32251, 64502, 129004, 161255, 258008, 322510, 516016, 645020, 1032032, 1290040, 2064064, 2580080, 4128128, 5160160, 10320320, 20640640]

約数ペア:

[(1, 20640640), (2, 10320320), (4, 5160160), (5, 4128128), (8, 2580080), (10, 2064064), (16, 1290040), (20, 1032032), (32, 645020), (40, 516016), (64, 322510), (80, 258008), (128, 161255), (160, 129004), (320, 64502), (640, 32251)]