642500

素因数分解:

$2^2\times 5^4\times {\mathrm{257}}^1$

素因数の和:281

約数の個数: 30

約数和(自身を含む): 1410486

約数和(自身を除く): 767986

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 250, 257, 500, 514, 625, 1028, 1250, 1285, 2500, 2570, 5140, 6425, 12850, 25700, 32125, 64250, 128500, 160625, 321250, 642500]

約数ペア:

[(1, 642500), (2, 321250), (4, 160625), (5, 128500), (10, 64250), (20, 32125), (25, 25700), (50, 12850), (100, 6425), (125, 5140), (250, 2570), (257, 2500), (500, 1285), (514, 1250), (625, 1028)]