20204451120 has 160 divisors (see below), whose sum is σ = 71680555008. Its totient is φ = 4611769344.

The previous prime is 20204451109. The next prime is 20204451121. The reversal of 20204451120 is 2115440202.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20204451121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1263817 + ... + 1279703.

Almost surely, 2^20204451120 is an apocalyptic number.

20204451120 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 20204451120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35840277504).

20204451120 is an abundant number, since it is smaller than the sum of its proper divisors (51476103888).

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

20204451120 is a wasteful number, since it uses less digits than its factorization.

20204451120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16667 (or 16661 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 20204451120 its reverse (2115440202), we get a palindrome (22319891322).

The spelling of 20204451120 in words is "twenty billion, two hundred four million, four hundred fifty-one thousand, one hundred twenty".