20040122440 has 64 divisors (see below), whose sum is σ = 48638746800. Its totient is φ = 7387241472.

The previous prime is 20040122423. The next prime is 20040122471. The reversal of 20040122440 is 4422104002.

It can be written as a sum of positive squares in 8 ways, for example, as 18438436 + 20021684004 = 4294^2 + 141498^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287326 + ... + 350194.

Almost surely, 2^20040122440 is an apocalyptic number.

20040122440 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 20040122440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24319373400).

20040122440 is an abundant number, since it is smaller than the sum of its proper divisors (28598624360).

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

20040122440 is a wasteful number, since it uses less digits than its factorization.

20040122440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63506 (or 63502 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 20040122440 its reverse (4422104002), we get a palindrome (24462226442).

The spelling of 20040122440 in words is "twenty billion, forty million, one hundred twenty-two thousand, four hundred forty".