20045442040 has 32 divisors (see below), whose sum is σ = 48571649280. Its totient is φ = 7401393792.

The previous prime is 20045442019. The next prime is 20045442041. The reversal of 20045442040 is 4024454002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20045441996 and 20045442014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045442041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19273944 + ... + 19274983.

It is an arithmetic number, because the mean of its divisors is an integer number (1517864040).

Almost surely, 2^20045442040 is an apocalyptic number.

20045442040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20045442040 is an abundant number, since it is smaller than the sum of its proper divisors (28526207240).

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

20045442040 is a wasteful number, since it uses less digits than its factorization.

20045442040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38548951 (or 38548947 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

Adding to 20045442040 its reverse (4024454002), we get a palindrome (24069896042).

The spelling of 20045442040 in words is "twenty billion, forty-five million, four hundred forty-two thousand, forty".