20400440

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4679}}^1$

素因数の和:4799

約数の個数: 32

約数和(自身を含む): 46332000

約数和(自身を除く): 25931560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4679, 9358, 18716, 23395, 37432, 46790, 93580, 187160, 510011, 1020022, 2040044, 2550055, 4080088, 5100110, 10200220, 20400440]

約数ペア:

[(1, 20400440), (2, 10200220), (4, 5100110), (5, 4080088), (8, 2550055), (10, 2040044), (20, 1020022), (40, 510011), (109, 187160), (218, 93580), (436, 46790), (545, 37432), (872, 23395), (1090, 18716), (2180, 9358), (4360, 4679)]