20550204 has 18 divisors (see below), whose sum is σ = 51946440. Its totient is φ = 6850056.

The previous prime is 20550199. The next prime is 20550209. The reversal of 20550204 is 40205502.

It is an interprime number because it is at equal distance from previous prime (20550199) and next prime (20550209).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285384 + ... + 285455.

Almost surely, 2^20550204 is an apocalyptic number.

It is an amenable number.

20550204 is an abundant number, since it is smaller than the sum of its proper divisors (31396236).

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

20550204 is a wasteful number, since it uses less digits than its factorization.

20550204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570849 (or 570844 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20550204 is about 4533.2332832097. The cubic root of 20550204 is about 273.9084177207.

Adding to 20550204 its reverse (40205502), we get a palindrome (60755706).

The spelling of 20550204 in words is "twenty million, five hundred fifty thousand, two hundred four".