20550051 has 8 divisors (see below), whose sum is σ = 30444560. Its totient is φ = 13700016.

The previous prime is 20550041. The next prime is 20550071. The reversal of 20550051 is 15005502.

It is not a de Polignac number, because 20550051 - 2¹⁰ = 20549027 is a prime.

It is a super-2 number, since 2×20550051² = 844609192205202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380530 + ... + 380583.

It is an arithmetic number, because the mean of its divisors is an integer number (3805570).

Almost surely, 2^20550051 is an apocalyptic number.

20550051 is a deficient number, since it is larger than the sum of its proper divisors (9894509).

20550051 is an equidigital number, since it uses as much as digits as its factorization.

20550051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761122 (or 761116 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 20550051 is about 4533.2164078058. The cubic root of 20550051 is about 273.9077379530.

Adding to 20550051 its reverse (15005502), we get a palindrome (35555553).

The spelling of 20550051 in words is "twenty million, five hundred fifty thousand, fifty-one".