21139415

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{983}}^1$

素因数の和:1039

約数の個数: 32

約数和(自身を含む): 30606336

約数和(自身を除く): 9466921

約数列:

[1, 5, 11, 17, 23, 55, 85, 115, 187, 253, 391, 935, 983, 1265, 1955, 4301, 4915, 10813, 16711, 21505, 22609, 54065, 83555, 113045, 183821, 248699, 384353, 919105, 1243495, 1921765, 4227883, 21139415]

約数ペア:

[(1, 21139415), (5, 4227883), (11, 1921765), (17, 1243495), (23, 919105), (55, 384353), (85, 248699), (115, 183821), (187, 113045), (253, 83555), (391, 54065), (935, 22609), (983, 21505), (1265, 16711), (1955, 10813), (4301, 4915)]