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20516149 is a prime number
BaseRepresentation
bin100111001000…
…0110100110101
31102121022212101
41032100310311
520223004044
62011422101
7336245563
oct116206465
942538771
1020516149
11106430a5
126a54931
134334344
142a20a33
151c03cd4
hex1390d35

20516149 has 2 divisors, whose sum is σ = 20516150. Its totient is φ = 20516148.

The previous prime is 20516147. The next prime is 20516173. The reversal of 20516149 is 94161502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19847025 + 669124 = 4455^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 20516149 - 21 = 20516147 is a prime.

Together with 20516147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20516147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258074 + 10258075.

It is an arithmetic number, because the mean of its divisors is an integer number (10258075).

Almost surely, 220516149 is an apocalyptic number.

It is an amenable number.

20516149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20516149 is an equidigital number, since it uses as much as digits as its factorization.

20516149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20516149 is about 4529.4755767086. The cubic root of 20516149 is about 273.7570306014.

The spelling of 20516149 in words is "twenty million, five hundred sixteen thousand, one hundred forty-nine".