20045442420 has 72 divisors (see below), whose sum is σ = 60826881024. Its totient is φ = 5343484608.

The previous prime is 20045442413. The next prime is 20045442457. The reversal of 20045442420 is 2424454002.

20045442420 is a `hidden beast` number, since 200 + 454 + 4 + 2 + 4 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 507837 + ... + 545883.

It is an arithmetic number, because the mean of its divisors is an integer number (844817792).

Almost surely, 2^20045442420 is an apocalyptic number.

20045442420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20045442420 is an abundant number, since it is smaller than the sum of its proper divisors (40781438604).

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

20045442420 is a wasteful number, since it uses less digits than its factorization.

20045442420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40989 (or 40984 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 27.

Adding to 20045442420 its reverse (2424454002), we get a palindrome (22469896422).

The spelling of 20045442420 in words is "twenty billion, forty-five million, four hundred forty-two thousand, four hundred twenty".