20570020 has 48 divisors (see below), whose sum is σ = 44835840. Its totient is φ = 7922304.

The previous prime is 20569999. The next prime is 20570021. The reversal of 20570020 is 2007502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20569976 and 20570003.

It is not an unprimeable number, because it can be changed into a prime (20570021) 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, 74122 + ... + 74398.

It is an arithmetic number, because the mean of its divisors is an integer number (934080).

Almost surely, 2^20570020 is an apocalyptic number.

20570020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20570020 is an abundant number, since it is smaller than the sum of its proper divisors (24265820).

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

20570020 is a wasteful number, since it uses less digits than its factorization.

20570020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 20570020 is about 4535.4183930482. The cubic root of 20570020 is about 273.9964302375.

Adding to 20570020 its reverse (2007502), we get a palindrome (22577522).

It can be divided in two parts, 205 and 70020, that added together give a square (70225 = 265²).

The spelling of 20570020 in words is "twenty million, five hundred seventy thousand, twenty".