20054640 has 40 divisors (see below), whose sum is σ = 62170128. Its totient is φ = 5347840.

The previous prime is 20054627. The next prime is 20054647. The reversal of 20054640 is 4645002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20054647) 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, 41541 + ... + 42020.

Almost surely, 2^20054640 is an apocalyptic number.

20054640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20054640 is an abundant number, since it is smaller than the sum of its proper divisors (42115488).

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

20054640 is a wasteful number, since it uses less digits than its factorization.

20054640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83577 (or 83571 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20054640 is about 4478.2407259994. The cubic root of 20054640 is about 271.6887298544.

Adding to 20054640 its reverse (4645002), we get a palindrome (24699642).

The spelling of 20054640 in words is "twenty million, fifty-four thousand, six hundred forty".