20550030 has 16 divisors (see below), whose sum is σ = 49320144. Its totient is φ = 5480000.

The previous prime is 20550007. The next prime is 20550037. The reversal of 20550030 is 3005502.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20549991 and 20550009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550037) 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, 342471 + ... + 342530.

It is an arithmetic number, because the mean of its divisors is an integer number (3082509).

Almost surely, 2^20550030 is an apocalyptic number.

20550030 is an abundant number, since it is smaller than the sum of its proper divisors (28770114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20550030 is a wasteful number, since it uses less digits than its factorization.

20550030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685011.

The product of its (nonzero) digits is 150, while the sum is 15.

The square root of 20550030 is about 4533.2140915690. The cubic root of 20550030 is about 273.9076446513.

Adding to 20550030 its reverse (3005502), we get a palindrome (23555532).

The spelling of 20550030 in words is "twenty million, five hundred fifty thousand, thirty".