20454040 has 16 divisors (see below), whose sum is σ = 46021680. Its totient is φ = 8181600.

The previous prime is 20454029. The next prime is 20454041. The reversal of 20454040 is 4045402.

It is a junction number, because it is equal to n+sod(n) for n = 20453999 and 20454017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454041) 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, 255636 + ... + 255715.

It is an arithmetic number, because the mean of its divisors is an integer number (2876355).

Almost surely, 2^20454040 is an apocalyptic number.

20454040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20454040 is an abundant number, since it is smaller than the sum of its proper divisors (25567640).

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

20454040 is a wasteful number, since it uses less digits than its factorization.

20454040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511362 (or 511358 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20454040 is about 4522.6142882187. The cubic root of 20454040 is about 273.4805010903.

Adding to 20454040 its reverse (4045402), we get a palindrome (24499442).

The spelling of 20454040 in words is "twenty million, four hundred fifty-four thousand, forty".