780400

素因数分解:

$2^4\times 5^2\times {\mathrm{1951}}^1$

素因数の和:1969

約数の個数: 30

約数和(自身を含む): 1875872

約数和(自身を除く): 1095472

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 1951, 3902, 7804, 9755, 15608, 19510, 31216, 39020, 48775, 78040, 97550, 156080, 195100, 390200, 780400]

約数ペア:

[(1, 780400), (2, 390200), (4, 195100), (5, 156080), (8, 97550), (10, 78040), (16, 48775), (20, 39020), (25, 31216), (40, 19510), (50, 15608), (80, 9755), (100, 7804), (200, 3902), (400, 1951)]