20534020 has 24 divisors (see below), whose sum is σ = 46439064. Its totient is φ = 7581696.

The previous prime is 20533999. The next prime is 20534029. The reversal of 20534020 is 2043502.

It can be written as a sum of positive squares in 4 ways, for example, as 4804864 + 15729156 = 2192^2 + 3966^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20533985 and 20534003.

It is not an unprimeable number, because it can be changed into a prime (20534029) 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, 39229 + ... + 39748.

It is an arithmetic number, because the mean of its divisors is an integer number (1934961).

Almost surely, 2^20534020 is an apocalyptic number.

20534020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20534020 is an abundant number, since it is smaller than the sum of its proper divisors (25905044).

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

20534020 is a wasteful number, since it uses less digits than its factorization.

20534020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78999 (or 78997 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20534020 is about 4531.4478922305. The cubic root of 20534020 is about 273.8364947033.

Adding to 20534020 its reverse (2043502), we get a palindrome (22577522).

It can be divided in two parts, 205 and 34020, that added together give a square (34225 = 185²).

The spelling of 20534020 in words is "twenty million, five hundred thirty-four thousand, twenty".