78840400

素因数分解:

$2^4\times 5^2\times {\mathrm{197101}}^1$

素因数の和:197119

約数の個数: 30

約数和(自身を含む): 189415022

約数和(自身を除く): 110574622

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 197101, 394202, 788404, 985505, 1576808, 1971010, 3153616, 3942020, 4927525, 7884040, 9855050, 15768080, 19710100, 39420200, 78840400]

約数ペア:

[(1, 78840400), (2, 39420200), (4, 19710100), (5, 15768080), (8, 9855050), (10, 7884040), (16, 4927525), (20, 3942020), (25, 3153616), (40, 1971010), (50, 1576808), (80, 985505), (100, 788404), (200, 394202), (400, 197101)]