20418380

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11471}}^1$

素因数の和:11569

約数の個数: 24

約数和(自身を含む): 43364160

約数和(自身を除く): 22945780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 11471, 22942, 45884, 57355, 114710, 229420, 1020919, 2041838, 4083676, 5104595, 10209190, 20418380]

約数ペア:

[(1, 20418380), (2, 10209190), (4, 5104595), (5, 4083676), (10, 2041838), (20, 1020919), (89, 229420), (178, 114710), (356, 57355), (445, 45884), (890, 22942), (1780, 11471)]