21245480

素因数分解:

$2^3\times 5^1\times {\mathrm{547}}^1\times {\mathrm{971}}^1$

素因数の和:1529

約数の個数: 32

約数和(自身を含む): 47939040

約数和(自身を除く): 26693560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 547, 971, 1094, 1942, 2188, 2735, 3884, 4376, 4855, 5470, 7768, 9710, 10940, 19420, 21880, 38840, 531137, 1062274, 2124548, 2655685, 4249096, 5311370, 10622740, 21245480]

約数ペア:

[(1, 21245480), (2, 10622740), (4, 5311370), (5, 4249096), (8, 2655685), (10, 2124548), (20, 1062274), (40, 531137), (547, 38840), (971, 21880), (1094, 19420), (1942, 10940), (2188, 9710), (2735, 7768), (3884, 5470), (4376, 4855)]