20420134120 has 192 divisors, whose sum is σ = 50599890000. Its totient is φ = 7389978624.

The previous prime is 20420134109. The next prime is 20420134121. The reversal of 20420134120 is 2143102402.

It can be written as a sum of positive squares in 8 ways, for example, as 9393874084 + 11026260036 = 96922^2 + 105006^2 .

It is not an unprimeable number, because it can be changed into a prime (20420134121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137047806 + ... + 137047954.

Almost surely, 2^20420134120 is an apocalyptic number.

20420134120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20420134120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25299945000).

20420134120 is an abundant number, since it is smaller than the sum of its proper divisors (30179755880).

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

20420134120 is a wasteful number, since it uses less digits than its factorization.

20420134120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20420134120 its reverse (2143102402), we get a palindrome (22563236522).

The spelling of 20420134120 in words is "twenty billion, four hundred twenty million, one hundred thirty-four thousand, one hundred twenty".