406690420

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{257399}}^1$

素因数の和:257487

約数の個数: 24

約数和(自身を含む): 864864000

約数和(自身を除く): 458173580

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 257399, 514798, 1029596, 1286995, 2573990, 5147980, 20334521, 40669042, 81338084, 101672605, 203345210, 406690420]

約数ペア:

[(1, 406690420), (2, 203345210), (4, 101672605), (5, 81338084), (10, 40669042), (20, 20334521), (79, 5147980), (158, 2573990), (316, 1286995), (395, 1029596), (790, 514798), (1580, 257399)]