20571040 has 48 divisors (see below), whose sum is σ = 55544832. Its totient is φ = 7052544.

The previous prime is 20571017. The next prime is 20571041. The reversal of 20571040 is 4017502.

It is a junction number, because it is equal to n+sod(n) for n = 20570999 and 20571017.

It is not an unprimeable number, because it can be changed into a prime (20571041) 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, 8064 + ... + 10303.

It is an arithmetic number, because the mean of its divisors is an integer number (1157184).

Almost surely, 2^20571040 is an apocalyptic number.

20571040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20571040 is an abundant number, since it is smaller than the sum of its proper divisors (34973792).

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

20571040 is a wasteful number, since it uses less digits than its factorization.

20571040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18389 (or 18381 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20571040 is about 4535.5308399348. The cubic root of 20571040 is about 274.0009590248. Note that the first 3 decimals are identical.

Adding to 20571040 its reverse (4017502), we get a palindrome (24588542).

The spelling of 20571040 in words is "twenty million, five hundred seventy-one thousand, forty".