20542003220 has 12 divisors (see below), whose sum is σ = 43138206804. Its totient is φ = 8216801280.

The previous prime is 20542003217. The next prime is 20542003247. The reversal of 20542003220 is 2230024502.

It can be written as a sum of positive squares in 2 ways, for example, as 7806429316 + 12735573904 = 88354^2 + 112852^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1027100161 = 20542003220 / (2 + 0 + 5 + 4 + 2 + 0 + 0 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 20542003192 and 20542003201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513550061 + ... + 513550100.

It is an arithmetic number, because the mean of its divisors is an integer number (3594850567).

Almost surely, 2^20542003220 is an apocalyptic number.

20542003220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20542003220 is an abundant number, since it is smaller than the sum of its proper divisors (22596203584).

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

20542003220 is a wasteful number, since it uses less digits than its factorization.

20542003220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027100170 (or 1027100168 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

Adding to 20542003220 its reverse (2230024502), we get a palindrome (22772027722).

The spelling of 20542003220 in words is "twenty billion, five hundred forty-two million, three thousand, two hundred twenty".