20042040400440 has 64 divisors (see below), whose sum is σ = 60148751484960. Its totient is φ = 5342532526080.

The previous prime is 20042040400433. The next prime is 20042040400451. The reversal of 20042040400440 is 4400404024002.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20042040400440.

It is a congruent number.

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, 31110781 + ... + 31748460.

Almost surely, 2^{20042040400440} is an apocalyptic number.

20042040400440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20042040400440 is an abundant number, since it is smaller than the sum of its proper divisors (40106711084520).

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

20042040400440 is a wasteful number, since it uses less digits than its factorization.

20042040400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62861912 (or 62861908 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 20042040400440 its reverse (4400404024002), we get a palindrome (24442444424442).

The spelling of 20042040400440 in words is "twenty trillion, forty-two billion, forty million, four hundred thousand, four hundred forty".