21289915

素因数分解:

$5^1\times {\mathrm{29}}^2\times {\mathrm{61}}^1\times {\mathrm{83}}^1$

素因数の和:207

約数の個数: 24

約数和(自身を含む): 27217008

約数和(自身を除く): 5927093

約数列:

[1, 5, 29, 61, 83, 145, 305, 415, 841, 1769, 2407, 4205, 5063, 8845, 12035, 25315, 51301, 69803, 146827, 256505, 349015, 734135, 4257983, 21289915]

約数ペア:

[(1, 21289915), (5, 4257983), (29, 734135), (61, 349015), (83, 256505), (145, 146827), (305, 69803), (415, 51301), (841, 25315), (1769, 12035), (2407, 8845), (4205, 5063)]