65440

素因数分解:

$2^5\times 5^1\times {\mathrm{409}}^1$

素因数の和:424

約数の個数: 24

約数和(自身を含む): 154980

約数和(自身を除く): 89540

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 409, 818, 1636, 2045, 3272, 4090, 6544, 8180, 13088, 16360, 32720, 65440]

約数ペア:

[(1, 65440), (2, 32720), (4, 16360), (5, 13088), (8, 8180), (10, 6544), (16, 4090), (20, 3272), (32, 2045), (40, 1636), (80, 818), (160, 409)]