20555004 has 12 divisors (see below), whose sum is σ = 47961704. Its totient is φ = 6851664.

The previous prime is 20554999. The next prime is 20555009. The reversal of 20555004 is 40055502.

It is an interprime number because it is at equal distance from previous prime (20554999) and next prime (20555009).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856447 + ... + 856470.

Almost surely, 2^20555004 is an apocalyptic number.

It is an amenable number.

20555004 is an abundant number, since it is smaller than the sum of its proper divisors (27406700).

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

20555004 is a wasteful number, since it uses less digits than its factorization.

20555004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712924 (or 1712922 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 20555004 is about 4533.7626757474. The cubic root of 20555004 is about 273.9297420516.

The spelling of 20555004 in words is "twenty million, five hundred fifty-five thousand, four".