20572005 has 16 divisors (see below), whose sum is σ = 34346880. Its totient is φ = 10494528.

The previous prime is 20571997. The next prime is 20572007. The reversal of 20572005 is 50027502.

It is not a de Polignac number, because 20572005 - 2³ = 20571997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29470 + ... + 30159.

It is an arithmetic number, because the mean of its divisors is an integer number (2146680).

Almost surely, 2^20572005 is an apocalyptic number.

It is an amenable number.

20572005 is a deficient number, since it is larger than the sum of its proper divisors (13774875).

20572005 is a wasteful number, since it uses less digits than its factorization.

20572005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59660.

The product of its (nonzero) digits is 700, while the sum is 21.

The square root of 20572005 is about 4535.6372209426. The cubic root of 20572005 is about 274.0052434751.

Adding to 20572005 its reverse (50027502), we get a palindrome (70599507).

The spelling of 20572005 in words is "twenty million, five hundred seventy-two thousand, five".