21516680

素因数分解:

$2^3\times 5^1\times {\mathrm{479}}^1\times {\mathrm{1123}}^1$

素因数の和:1613

約数の個数: 32

約数和(自身を含む): 48556800

約数和(自身を除く): 27040120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 479, 958, 1123, 1916, 2246, 2395, 3832, 4492, 4790, 5615, 8984, 9580, 11230, 19160, 22460, 44920, 537917, 1075834, 2151668, 2689585, 4303336, 5379170, 10758340, 21516680]

約数ペア:

[(1, 21516680), (2, 10758340), (4, 5379170), (5, 4303336), (8, 2689585), (10, 2151668), (20, 1075834), (40, 537917), (479, 44920), (958, 22460), (1123, 19160), (1916, 11230), (2246, 9580), (2395, 8984), (3832, 5615), (4492, 4790)]